edit this statistic or download as text // json
Identifier
Values
[.,.] => 0
[.,[.,.]] => 1
[[.,.],.] => 1
[.,[.,[.,.]]] => 3
[.,[[.,.],.]] => 3
[[.,.],[.,.]] => 2
[[.,[.,.]],.] => 3
[[[.,.],.],.] => 3
[.,[.,[.,[.,.]]]] => 6
[.,[.,[[.,.],.]]] => 6
[.,[[.,.],[.,.]]] => 5
[.,[[.,[.,.]],.]] => 6
[.,[[[.,.],.],.]] => 6
[[.,.],[.,[.,.]]] => 4
[[.,.],[[.,.],.]] => 4
[[.,[.,.]],[.,.]] => 4
[[[.,.],.],[.,.]] => 4
[[.,[.,[.,.]]],.] => 6
[[.,[[.,.],.]],.] => 6
[[[.,.],[.,.]],.] => 5
[[[.,[.,.]],.],.] => 6
[[[[.,.],.],.],.] => 6
[.,[.,[.,[.,[.,.]]]]] => 10
[.,[.,[.,[[.,.],.]]]] => 10
[.,[.,[[.,.],[.,.]]]] => 9
[.,[.,[[.,[.,.]],.]]] => 10
[.,[.,[[[.,.],.],.]]] => 10
[.,[[.,.],[.,[.,.]]]] => 8
[.,[[.,.],[[.,.],.]]] => 8
[.,[[.,[.,.]],[.,.]]] => 8
[.,[[[.,.],.],[.,.]]] => 8
[.,[[.,[.,[.,.]]],.]] => 10
[.,[[.,[[.,.],.]],.]] => 10
[.,[[[.,.],[.,.]],.]] => 9
[.,[[[.,[.,.]],.],.]] => 10
[.,[[[[.,.],.],.],.]] => 10
[[.,.],[.,[.,[.,.]]]] => 7
[[.,.],[.,[[.,.],.]]] => 7
[[.,.],[[.,.],[.,.]]] => 6
[[.,.],[[.,[.,.]],.]] => 7
[[.,.],[[[.,.],.],.]] => 7
[[.,[.,.]],[.,[.,.]]] => 6
[[.,[.,.]],[[.,.],.]] => 6
[[[.,.],.],[.,[.,.]]] => 6
[[[.,.],.],[[.,.],.]] => 6
[[.,[.,[.,.]]],[.,.]] => 7
[[.,[[.,.],.]],[.,.]] => 7
[[[.,.],[.,.]],[.,.]] => 6
[[[.,[.,.]],.],[.,.]] => 7
[[[[.,.],.],.],[.,.]] => 7
[[.,[.,[.,[.,.]]]],.] => 10
[[.,[.,[[.,.],.]]],.] => 10
[[.,[[.,.],[.,.]]],.] => 9
[[.,[[.,[.,.]],.]],.] => 10
[[.,[[[.,.],.],.]],.] => 10
[[[.,.],[.,[.,.]]],.] => 8
[[[.,.],[[.,.],.]],.] => 8
[[[.,[.,.]],[.,.]],.] => 8
[[[[.,.],.],[.,.]],.] => 8
[[[.,[.,[.,.]]],.],.] => 10
[[[.,[[.,.],.]],.],.] => 10
[[[[.,.],[.,.]],.],.] => 9
[[[[.,[.,.]],.],.],.] => 10
[[[[[.,.],.],.],.],.] => 10
[.,[.,[.,[.,[.,[.,.]]]]]] => 15
[.,[.,[.,[.,[[.,.],.]]]]] => 15
[.,[.,[.,[[.,.],[.,.]]]]] => 14
[.,[.,[.,[[.,[.,.]],.]]]] => 15
[.,[.,[.,[[[.,.],.],.]]]] => 15
[.,[.,[[.,.],[.,[.,.]]]]] => 13
[.,[.,[[.,.],[[.,.],.]]]] => 13
[.,[.,[[.,[.,.]],[.,.]]]] => 13
[.,[.,[[[.,.],.],[.,.]]]] => 13
[.,[.,[[.,[.,[.,.]]],.]]] => 15
[.,[.,[[.,[[.,.],.]],.]]] => 15
[.,[.,[[[.,.],[.,.]],.]]] => 14
[.,[.,[[[.,[.,.]],.],.]]] => 15
[.,[.,[[[[.,.],.],.],.]]] => 15
[.,[[.,.],[.,[.,[.,.]]]]] => 12
[.,[[.,.],[.,[[.,.],.]]]] => 12
[.,[[.,.],[[.,.],[.,.]]]] => 11
[.,[[.,.],[[.,[.,.]],.]]] => 12
[.,[[.,.],[[[.,.],.],.]]] => 12
[.,[[.,[.,.]],[.,[.,.]]]] => 11
[.,[[.,[.,.]],[[.,.],.]]] => 11
[.,[[[.,.],.],[.,[.,.]]]] => 11
[.,[[[.,.],.],[[.,.],.]]] => 11
[.,[[.,[.,[.,.]]],[.,.]]] => 12
[.,[[.,[[.,.],.]],[.,.]]] => 12
[.,[[[.,.],[.,.]],[.,.]]] => 11
[.,[[[.,[.,.]],.],[.,.]]] => 12
[.,[[[[.,.],.],.],[.,.]]] => 12
[.,[[.,[.,[.,[.,.]]]],.]] => 15
[.,[[.,[.,[[.,.],.]]],.]] => 15
[.,[[.,[[.,.],[.,.]]],.]] => 14
[.,[[.,[[.,[.,.]],.]],.]] => 15
[.,[[.,[[[.,.],.],.]],.]] => 15
[.,[[[.,.],[.,[.,.]]],.]] => 13
[.,[[[.,.],[[.,.],.]],.]] => 13
[.,[[[.,[.,.]],[.,.]],.]] => 13
[.,[[[[.,.],.],[.,.]],.]] => 13
>>> Load all 1200 entries. <<<
[.,[[[.,[.,[.,.]]],.],.]] => 15
[.,[[[.,[[.,.],.]],.],.]] => 15
[.,[[[[.,.],[.,.]],.],.]] => 14
[.,[[[[.,[.,.]],.],.],.]] => 15
[.,[[[[[.,.],.],.],.],.]] => 15
[[.,.],[.,[.,[.,[.,.]]]]] => 11
[[.,.],[.,[.,[[.,.],.]]]] => 11
[[.,.],[.,[[.,.],[.,.]]]] => 10
[[.,.],[.,[[.,[.,.]],.]]] => 11
[[.,.],[.,[[[.,.],.],.]]] => 11
[[.,.],[[.,.],[.,[.,.]]]] => 9
[[.,.],[[.,.],[[.,.],.]]] => 9
[[.,.],[[.,[.,.]],[.,.]]] => 9
[[.,.],[[[.,.],.],[.,.]]] => 9
[[.,.],[[.,[.,[.,.]]],.]] => 11
[[.,.],[[.,[[.,.],.]],.]] => 11
[[.,.],[[[.,.],[.,.]],.]] => 10
[[.,.],[[[.,[.,.]],.],.]] => 11
[[.,.],[[[[.,.],.],.],.]] => 11
[[.,[.,.]],[.,[.,[.,.]]]] => 9
[[.,[.,.]],[.,[[.,.],.]]] => 9
[[.,[.,.]],[[.,.],[.,.]]] => 8
[[.,[.,.]],[[.,[.,.]],.]] => 9
[[.,[.,.]],[[[.,.],.],.]] => 9
[[[.,.],.],[.,[.,[.,.]]]] => 9
[[[.,.],.],[.,[[.,.],.]]] => 9
[[[.,.],.],[[.,.],[.,.]]] => 8
[[[.,.],.],[[.,[.,.]],.]] => 9
[[[.,.],.],[[[.,.],.],.]] => 9
[[.,[.,[.,.]]],[.,[.,.]]] => 9
[[.,[.,[.,.]]],[[.,.],.]] => 9
[[.,[[.,.],.]],[.,[.,.]]] => 9
[[.,[[.,.],.]],[[.,.],.]] => 9
[[[.,.],[.,.]],[.,[.,.]]] => 8
[[[.,.],[.,.]],[[.,.],.]] => 8
[[[.,[.,.]],.],[.,[.,.]]] => 9
[[[.,[.,.]],.],[[.,.],.]] => 9
[[[[.,.],.],.],[.,[.,.]]] => 9
[[[[.,.],.],.],[[.,.],.]] => 9
[[.,[.,[.,[.,.]]]],[.,.]] => 11
[[.,[.,[[.,.],.]]],[.,.]] => 11
[[.,[[.,.],[.,.]]],[.,.]] => 10
[[.,[[.,[.,.]],.]],[.,.]] => 11
[[.,[[[.,.],.],.]],[.,.]] => 11
[[[.,.],[.,[.,.]]],[.,.]] => 9
[[[.,.],[[.,.],.]],[.,.]] => 9
[[[.,[.,.]],[.,.]],[.,.]] => 9
[[[[.,.],.],[.,.]],[.,.]] => 9
[[[.,[.,[.,.]]],.],[.,.]] => 11
[[[.,[[.,.],.]],.],[.,.]] => 11
[[[[.,.],[.,.]],.],[.,.]] => 10
[[[[.,[.,.]],.],.],[.,.]] => 11
[[[[[.,.],.],.],.],[.,.]] => 11
[[.,[.,[.,[.,[.,.]]]]],.] => 15
[[.,[.,[.,[[.,.],.]]]],.] => 15
[[.,[.,[[.,.],[.,.]]]],.] => 14
[[.,[.,[[.,[.,.]],.]]],.] => 15
[[.,[.,[[[.,.],.],.]]],.] => 15
[[.,[[.,.],[.,[.,.]]]],.] => 13
[[.,[[.,.],[[.,.],.]]],.] => 13
[[.,[[.,[.,.]],[.,.]]],.] => 13
[[.,[[[.,.],.],[.,.]]],.] => 13
[[.,[[.,[.,[.,.]]],.]],.] => 15
[[.,[[.,[[.,.],.]],.]],.] => 15
[[.,[[[.,.],[.,.]],.]],.] => 14
[[.,[[[.,[.,.]],.],.]],.] => 15
[[.,[[[[.,.],.],.],.]],.] => 15
[[[.,.],[.,[.,[.,.]]]],.] => 12
[[[.,.],[.,[[.,.],.]]],.] => 12
[[[.,.],[[.,.],[.,.]]],.] => 11
[[[.,.],[[.,[.,.]],.]],.] => 12
[[[.,.],[[[.,.],.],.]],.] => 12
[[[.,[.,.]],[.,[.,.]]],.] => 11
[[[.,[.,.]],[[.,.],.]],.] => 11
[[[[.,.],.],[.,[.,.]]],.] => 11
[[[[.,.],.],[[.,.],.]],.] => 11
[[[.,[.,[.,.]]],[.,.]],.] => 12
[[[.,[[.,.],.]],[.,.]],.] => 12
[[[[.,.],[.,.]],[.,.]],.] => 11
[[[[.,[.,.]],.],[.,.]],.] => 12
[[[[[.,.],.],.],[.,.]],.] => 12
[[[.,[.,[.,[.,.]]]],.],.] => 15
[[[.,[.,[[.,.],.]]],.],.] => 15
[[[.,[[.,.],[.,.]]],.],.] => 14
[[[.,[[.,[.,.]],.]],.],.] => 15
[[[.,[[[.,.],.],.]],.],.] => 15
[[[[.,.],[.,[.,.]]],.],.] => 13
[[[[.,.],[[.,.],.]],.],.] => 13
[[[[.,[.,.]],[.,.]],.],.] => 13
[[[[[.,.],.],[.,.]],.],.] => 13
[[[[.,[.,[.,.]]],.],.],.] => 15
[[[[.,[[.,.],.]],.],.],.] => 15
[[[[[.,.],[.,.]],.],.],.] => 14
[[[[[.,[.,.]],.],.],.],.] => 15
[[[[[[.,.],.],.],.],.],.] => 15
[.,[.,[.,[.,[.,[.,[.,.]]]]]]] => 21
[.,[.,[.,[.,[.,[[.,.],.]]]]]] => 21
[.,[.,[.,[.,[[.,.],[.,.]]]]]] => 20
[.,[.,[.,[.,[[.,[.,.]],.]]]]] => 21
[.,[.,[.,[.,[[[.,.],.],.]]]]] => 21
[.,[.,[.,[[.,.],[.,[.,.]]]]]] => 19
[.,[.,[.,[[.,.],[[.,.],.]]]]] => 19
[.,[.,[.,[[.,[.,.]],[.,.]]]]] => 19
[.,[.,[.,[[[.,.],.],[.,.]]]]] => 19
[.,[.,[.,[[.,[.,[.,.]]],.]]]] => 21
[.,[.,[.,[[.,[[.,.],.]],.]]]] => 21
[.,[.,[.,[[[.,.],[.,.]],.]]]] => 20
[.,[.,[.,[[[.,[.,.]],.],.]]]] => 21
[.,[.,[.,[[[[.,.],.],.],.]]]] => 21
[.,[.,[[.,.],[.,[.,[.,.]]]]]] => 18
[.,[.,[[.,.],[.,[[.,.],.]]]]] => 18
[.,[.,[[.,.],[[.,.],[.,.]]]]] => 17
[.,[.,[[.,.],[[.,[.,.]],.]]]] => 18
[.,[.,[[.,.],[[[.,.],.],.]]]] => 18
[.,[.,[[.,[.,.]],[.,[.,.]]]]] => 17
[.,[.,[[.,[.,.]],[[.,.],.]]]] => 17
[.,[.,[[[.,.],.],[.,[.,.]]]]] => 17
[.,[.,[[[.,.],.],[[.,.],.]]]] => 17
[.,[.,[[.,[.,[.,.]]],[.,.]]]] => 18
[.,[.,[[.,[[.,.],.]],[.,.]]]] => 18
[.,[.,[[[.,.],[.,.]],[.,.]]]] => 17
[.,[.,[[[.,[.,.]],.],[.,.]]]] => 18
[.,[.,[[[[.,.],.],.],[.,.]]]] => 18
[.,[.,[[.,[.,[.,[.,.]]]],.]]] => 21
[.,[.,[[.,[.,[[.,.],.]]],.]]] => 21
[.,[.,[[.,[[.,.],[.,.]]],.]]] => 20
[.,[.,[[.,[[.,[.,.]],.]],.]]] => 21
[.,[.,[[.,[[[.,.],.],.]],.]]] => 21
[.,[.,[[[.,.],[.,[.,.]]],.]]] => 19
[.,[.,[[[.,.],[[.,.],.]],.]]] => 19
[.,[.,[[[.,[.,.]],[.,.]],.]]] => 19
[.,[.,[[[[.,.],.],[.,.]],.]]] => 19
[.,[.,[[[.,[.,[.,.]]],.],.]]] => 21
[.,[.,[[[.,[[.,.],.]],.],.]]] => 21
[.,[.,[[[[.,.],[.,.]],.],.]]] => 20
[.,[.,[[[[.,[.,.]],.],.],.]]] => 21
[.,[.,[[[[[.,.],.],.],.],.]]] => 21
[.,[[.,.],[.,[.,[.,[.,.]]]]]] => 17
[.,[[.,.],[.,[.,[[.,.],.]]]]] => 17
[.,[[.,.],[.,[[.,.],[.,.]]]]] => 16
[.,[[.,.],[.,[[.,[.,.]],.]]]] => 17
[.,[[.,.],[.,[[[.,.],.],.]]]] => 17
[.,[[.,.],[[.,.],[.,[.,.]]]]] => 15
[.,[[.,.],[[.,.],[[.,.],.]]]] => 15
[.,[[.,.],[[.,[.,.]],[.,.]]]] => 15
[.,[[.,.],[[[.,.],.],[.,.]]]] => 15
[.,[[.,.],[[.,[.,[.,.]]],.]]] => 17
[.,[[.,.],[[.,[[.,.],.]],.]]] => 17
[.,[[.,.],[[[.,.],[.,.]],.]]] => 16
[.,[[.,.],[[[.,[.,.]],.],.]]] => 17
[.,[[.,.],[[[[.,.],.],.],.]]] => 17
[.,[[.,[.,.]],[.,[.,[.,.]]]]] => 15
[.,[[.,[.,.]],[.,[[.,.],.]]]] => 15
[.,[[.,[.,.]],[[.,.],[.,.]]]] => 14
[.,[[.,[.,.]],[[.,[.,.]],.]]] => 15
[.,[[.,[.,.]],[[[.,.],.],.]]] => 15
[.,[[[.,.],.],[.,[.,[.,.]]]]] => 15
[.,[[[.,.],.],[.,[[.,.],.]]]] => 15
[.,[[[.,.],.],[[.,.],[.,.]]]] => 14
[.,[[[.,.],.],[[.,[.,.]],.]]] => 15
[.,[[[.,.],.],[[[.,.],.],.]]] => 15
[.,[[.,[.,[.,.]]],[.,[.,.]]]] => 15
[.,[[.,[.,[.,.]]],[[.,.],.]]] => 15
[.,[[.,[[.,.],.]],[.,[.,.]]]] => 15
[.,[[.,[[.,.],.]],[[.,.],.]]] => 15
[.,[[[.,.],[.,.]],[.,[.,.]]]] => 14
[.,[[[.,.],[.,.]],[[.,.],.]]] => 14
[.,[[[.,[.,.]],.],[.,[.,.]]]] => 15
[.,[[[.,[.,.]],.],[[.,.],.]]] => 15
[.,[[[[.,.],.],.],[.,[.,.]]]] => 15
[.,[[[[.,.],.],.],[[.,.],.]]] => 15
[.,[[.,[.,[.,[.,.]]]],[.,.]]] => 17
[.,[[.,[.,[[.,.],.]]],[.,.]]] => 17
[.,[[.,[[.,.],[.,.]]],[.,.]]] => 16
[.,[[.,[[.,[.,.]],.]],[.,.]]] => 17
[.,[[.,[[[.,.],.],.]],[.,.]]] => 17
[.,[[[.,.],[.,[.,.]]],[.,.]]] => 15
[.,[[[.,.],[[.,.],.]],[.,.]]] => 15
[.,[[[.,[.,.]],[.,.]],[.,.]]] => 15
[.,[[[[.,.],.],[.,.]],[.,.]]] => 15
[.,[[[.,[.,[.,.]]],.],[.,.]]] => 17
[.,[[[.,[[.,.],.]],.],[.,.]]] => 17
[.,[[[[.,.],[.,.]],.],[.,.]]] => 16
[.,[[[[.,[.,.]],.],.],[.,.]]] => 17
[.,[[[[[.,.],.],.],.],[.,.]]] => 17
[.,[[.,[.,[.,[.,[.,.]]]]],.]] => 21
[.,[[.,[.,[.,[[.,.],.]]]],.]] => 21
[.,[[.,[.,[[.,.],[.,.]]]],.]] => 20
[.,[[.,[.,[[.,[.,.]],.]]],.]] => 21
[.,[[.,[.,[[[.,.],.],.]]],.]] => 21
[.,[[.,[[.,.],[.,[.,.]]]],.]] => 19
[.,[[.,[[.,.],[[.,.],.]]],.]] => 19
[.,[[.,[[.,[.,.]],[.,.]]],.]] => 19
[.,[[.,[[[.,.],.],[.,.]]],.]] => 19
[.,[[.,[[.,[.,[.,.]]],.]],.]] => 21
[.,[[.,[[.,[[.,.],.]],.]],.]] => 21
[.,[[.,[[[.,.],[.,.]],.]],.]] => 20
[.,[[.,[[[.,[.,.]],.],.]],.]] => 21
[.,[[.,[[[[.,.],.],.],.]],.]] => 21
[.,[[[.,.],[.,[.,[.,.]]]],.]] => 18
[.,[[[.,.],[.,[[.,.],.]]],.]] => 18
[.,[[[.,.],[[.,.],[.,.]]],.]] => 17
[.,[[[.,.],[[.,[.,.]],.]],.]] => 18
[.,[[[.,.],[[[.,.],.],.]],.]] => 18
[.,[[[.,[.,.]],[.,[.,.]]],.]] => 17
[.,[[[.,[.,.]],[[.,.],.]],.]] => 17
[.,[[[[.,.],.],[.,[.,.]]],.]] => 17
[.,[[[[.,.],.],[[.,.],.]],.]] => 17
[.,[[[.,[.,[.,.]]],[.,.]],.]] => 18
[.,[[[.,[[.,.],.]],[.,.]],.]] => 18
[.,[[[[.,.],[.,.]],[.,.]],.]] => 17
[.,[[[[.,[.,.]],.],[.,.]],.]] => 18
[.,[[[[[.,.],.],.],[.,.]],.]] => 18
[.,[[[.,[.,[.,[.,.]]]],.],.]] => 21
[.,[[[.,[.,[[.,.],.]]],.],.]] => 21
[.,[[[.,[[.,.],[.,.]]],.],.]] => 20
[.,[[[.,[[.,[.,.]],.]],.],.]] => 21
[.,[[[.,[[[.,.],.],.]],.],.]] => 21
[.,[[[[.,.],[.,[.,.]]],.],.]] => 19
[.,[[[[.,.],[[.,.],.]],.],.]] => 19
[.,[[[[.,[.,.]],[.,.]],.],.]] => 19
[.,[[[[[.,.],.],[.,.]],.],.]] => 19
[.,[[[[.,[.,[.,.]]],.],.],.]] => 21
[.,[[[[.,[[.,.],.]],.],.],.]] => 21
[.,[[[[[.,.],[.,.]],.],.],.]] => 20
[.,[[[[[.,[.,.]],.],.],.],.]] => 21
[.,[[[[[[.,.],.],.],.],.],.]] => 21
[[.,.],[.,[.,[.,[.,[.,.]]]]]] => 16
[[.,.],[.,[.,[.,[[.,.],.]]]]] => 16
[[.,.],[.,[.,[[.,.],[.,.]]]]] => 15
[[.,.],[.,[.,[[.,[.,.]],.]]]] => 16
[[.,.],[.,[.,[[[.,.],.],.]]]] => 16
[[.,.],[.,[[.,.],[.,[.,.]]]]] => 14
[[.,.],[.,[[.,.],[[.,.],.]]]] => 14
[[.,.],[.,[[.,[.,.]],[.,.]]]] => 14
[[.,.],[.,[[[.,.],.],[.,.]]]] => 14
[[.,.],[.,[[.,[.,[.,.]]],.]]] => 16
[[.,.],[.,[[.,[[.,.],.]],.]]] => 16
[[.,.],[.,[[[.,.],[.,.]],.]]] => 15
[[.,.],[.,[[[.,[.,.]],.],.]]] => 16
[[.,.],[.,[[[[.,.],.],.],.]]] => 16
[[.,.],[[.,.],[.,[.,[.,.]]]]] => 13
[[.,.],[[.,.],[.,[[.,.],.]]]] => 13
[[.,.],[[.,.],[[.,.],[.,.]]]] => 12
[[.,.],[[.,.],[[.,[.,.]],.]]] => 13
[[.,.],[[.,.],[[[.,.],.],.]]] => 13
[[.,.],[[.,[.,.]],[.,[.,.]]]] => 12
[[.,.],[[.,[.,.]],[[.,.],.]]] => 12
[[.,.],[[[.,.],.],[.,[.,.]]]] => 12
[[.,.],[[[.,.],.],[[.,.],.]]] => 12
[[.,.],[[.,[.,[.,.]]],[.,.]]] => 13
[[.,.],[[.,[[.,.],.]],[.,.]]] => 13
[[.,.],[[[.,.],[.,.]],[.,.]]] => 12
[[.,.],[[[.,[.,.]],.],[.,.]]] => 13
[[.,.],[[[[.,.],.],.],[.,.]]] => 13
[[.,.],[[.,[.,[.,[.,.]]]],.]] => 16
[[.,.],[[.,[.,[[.,.],.]]],.]] => 16
[[.,.],[[.,[[.,.],[.,.]]],.]] => 15
[[.,.],[[.,[[.,[.,.]],.]],.]] => 16
[[.,.],[[.,[[[.,.],.],.]],.]] => 16
[[.,.],[[[.,.],[.,[.,.]]],.]] => 14
[[.,.],[[[.,.],[[.,.],.]],.]] => 14
[[.,.],[[[.,[.,.]],[.,.]],.]] => 14
[[.,.],[[[[.,.],.],[.,.]],.]] => 14
[[.,.],[[[.,[.,[.,.]]],.],.]] => 16
[[.,.],[[[.,[[.,.],.]],.],.]] => 16
[[.,.],[[[[.,.],[.,.]],.],.]] => 15
[[.,.],[[[[.,[.,.]],.],.],.]] => 16
[[.,.],[[[[[.,.],.],.],.],.]] => 16
[[.,[.,.]],[.,[.,[.,[.,.]]]]] => 13
[[.,[.,.]],[.,[.,[[.,.],.]]]] => 13
[[.,[.,.]],[.,[[.,.],[.,.]]]] => 12
[[.,[.,.]],[.,[[.,[.,.]],.]]] => 13
[[.,[.,.]],[.,[[[.,.],.],.]]] => 13
[[.,[.,.]],[[.,.],[.,[.,.]]]] => 11
[[.,[.,.]],[[.,.],[[.,.],.]]] => 11
[[.,[.,.]],[[.,[.,.]],[.,.]]] => 11
[[.,[.,.]],[[[.,.],.],[.,.]]] => 11
[[.,[.,.]],[[.,[.,[.,.]]],.]] => 13
[[.,[.,.]],[[.,[[.,.],.]],.]] => 13
[[.,[.,.]],[[[.,.],[.,.]],.]] => 12
[[.,[.,.]],[[[.,[.,.]],.],.]] => 13
[[.,[.,.]],[[[[.,.],.],.],.]] => 13
[[[.,.],.],[.,[.,[.,[.,.]]]]] => 13
[[[.,.],.],[.,[.,[[.,.],.]]]] => 13
[[[.,.],.],[.,[[.,.],[.,.]]]] => 12
[[[.,.],.],[.,[[.,[.,.]],.]]] => 13
[[[.,.],.],[.,[[[.,.],.],.]]] => 13
[[[.,.],.],[[.,.],[.,[.,.]]]] => 11
[[[.,.],.],[[.,.],[[.,.],.]]] => 11
[[[.,.],.],[[.,[.,.]],[.,.]]] => 11
[[[.,.],.],[[[.,.],.],[.,.]]] => 11
[[[.,.],.],[[.,[.,[.,.]]],.]] => 13
[[[.,.],.],[[.,[[.,.],.]],.]] => 13
[[[.,.],.],[[[.,.],[.,.]],.]] => 12
[[[.,.],.],[[[.,[.,.]],.],.]] => 13
[[[.,.],.],[[[[.,.],.],.],.]] => 13
[[.,[.,[.,.]]],[.,[.,[.,.]]]] => 12
[[.,[.,[.,.]]],[.,[[.,.],.]]] => 12
[[.,[.,[.,.]]],[[.,.],[.,.]]] => 11
[[.,[.,[.,.]]],[[.,[.,.]],.]] => 12
[[.,[.,[.,.]]],[[[.,.],.],.]] => 12
[[.,[[.,.],.]],[.,[.,[.,.]]]] => 12
[[.,[[.,.],.]],[.,[[.,.],.]]] => 12
[[.,[[.,.],.]],[[.,.],[.,.]]] => 11
[[.,[[.,.],.]],[[.,[.,.]],.]] => 12
[[.,[[.,.],.]],[[[.,.],.],.]] => 12
[[[.,.],[.,.]],[.,[.,[.,.]]]] => 11
[[[.,.],[.,.]],[.,[[.,.],.]]] => 11
[[[.,.],[.,.]],[[.,.],[.,.]]] => 10
[[[.,.],[.,.]],[[.,[.,.]],.]] => 11
[[[.,.],[.,.]],[[[.,.],.],.]] => 11
[[[.,[.,.]],.],[.,[.,[.,.]]]] => 12
[[[.,[.,.]],.],[.,[[.,.],.]]] => 12
[[[.,[.,.]],.],[[.,.],[.,.]]] => 11
[[[.,[.,.]],.],[[.,[.,.]],.]] => 12
[[[.,[.,.]],.],[[[.,.],.],.]] => 12
[[[[.,.],.],.],[.,[.,[.,.]]]] => 12
[[[[.,.],.],.],[.,[[.,.],.]]] => 12
[[[[.,.],.],.],[[.,.],[.,.]]] => 11
[[[[.,.],.],.],[[.,[.,.]],.]] => 12
[[[[.,.],.],.],[[[.,.],.],.]] => 12
[[.,[.,[.,[.,.]]]],[.,[.,.]]] => 13
[[.,[.,[.,[.,.]]]],[[.,.],.]] => 13
[[.,[.,[[.,.],.]]],[.,[.,.]]] => 13
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[[.,[[.,.],[.,.]]],[.,[.,.]]] => 12
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[[.,[[.,[.,.]],.]],[.,[.,.]]] => 13
[[.,[[.,[.,.]],.]],[[.,.],.]] => 13
[[.,[[[.,.],.],.]],[.,[.,.]]] => 13
[[.,[[[.,.],.],.]],[[.,.],.]] => 13
[[[.,.],[.,[.,.]]],[.,[.,.]]] => 11
[[[.,.],[.,[.,.]]],[[.,.],.]] => 11
[[[.,.],[[.,.],.]],[.,[.,.]]] => 11
[[[.,.],[[.,.],.]],[[.,.],.]] => 11
[[[.,[.,.]],[.,.]],[.,[.,.]]] => 11
[[[.,[.,.]],[.,.]],[[.,.],.]] => 11
[[[[.,.],.],[.,.]],[.,[.,.]]] => 11
[[[[.,.],.],[.,.]],[[.,.],.]] => 11
[[[.,[.,[.,.]]],.],[.,[.,.]]] => 13
[[[.,[.,[.,.]]],.],[[.,.],.]] => 13
[[[.,[[.,.],.]],.],[.,[.,.]]] => 13
[[[.,[[.,.],.]],.],[[.,.],.]] => 13
[[[[.,.],[.,.]],.],[.,[.,.]]] => 12
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[[[[.,[.,.]],.],.],[.,[.,.]]] => 13
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[[[[[.,.],.],.],.],[[.,.],.]] => 13
[[.,[.,[.,[.,[.,.]]]]],[.,.]] => 16
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[[.,[[.,[[.,.],.]],.]],[.,.]] => 16
[[.,[[[.,.],[.,.]],.]],[.,.]] => 15
[[.,[[[.,[.,.]],.],.]],[.,.]] => 16
[[.,[[[[.,.],.],.],.]],[.,.]] => 16
[[[.,.],[.,[.,[.,.]]]],[.,.]] => 13
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[[[.,.],[[.,.],[.,.]]],[.,.]] => 12
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[[[[.,.],.],[[.,.],.]],[.,.]] => 12
[[[.,[.,[.,.]]],[.,.]],[.,.]] => 13
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[[[[.,.],[.,.]],[.,.]],[.,.]] => 12
[[[[.,[.,.]],.],[.,.]],[.,.]] => 13
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[[[.,[[.,.],[.,.]]],.],[.,.]] => 15
[[[.,[[.,[.,.]],.]],.],[.,.]] => 16
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[[[[.,.],[[.,.],.]],.],[.,.]] => 14
[[[[.,[.,.]],[.,.]],.],[.,.]] => 14
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[[[[[.,.],[.,.]],.],.],[.,.]] => 15
[[[[[.,[.,.]],.],.],.],[.,.]] => 16
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[[.,[.,[.,[.,[.,[.,.]]]]]],.] => 21
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[[.,[.,[.,[[.,.],[.,.]]]]],.] => 20
[[.,[.,[.,[[.,[.,.]],.]]]],.] => 21
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[[.,[.,[[.,[.,[.,.]]],.]]],.] => 21
[[.,[.,[[.,[[.,.],.]],.]]],.] => 21
[[.,[.,[[[.,.],[.,.]],.]]],.] => 20
[[.,[.,[[[.,[.,.]],.],.]]],.] => 21
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[[.,[[.,[[.,.],[.,.]]],.]],.] => 20
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[[.,[[[.,.],[.,[.,.]]],.]],.] => 19
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[[.,[[[.,[.,.]],[.,.]],.]],.] => 19
[[.,[[[[.,.],.],[.,.]],.]],.] => 19
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[[.,[[[.,[[.,.],.]],.],.]],.] => 21
[[.,[[[[.,.],[.,.]],.],.]],.] => 20
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[[[.,.],[[[.,.],[.,.]],.]],.] => 16
[[[.,.],[[[.,[.,.]],.],.]],.] => 17
[[[.,.],[[[[.,.],.],.],.]],.] => 17
[[[.,[.,.]],[.,[.,[.,.]]]],.] => 15
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[[[.,[.,.]],[[.,.],[.,.]]],.] => 14
[[[.,[.,.]],[[.,[.,.]],.]],.] => 15
[[[.,[.,.]],[[[.,.],.],.]],.] => 15
[[[[.,.],.],[.,[.,[.,.]]]],.] => 15
[[[[.,.],.],[.,[[.,.],.]]],.] => 15
[[[[.,.],.],[[.,.],[.,.]]],.] => 14
[[[[.,.],.],[[.,[.,.]],.]],.] => 15
[[[[.,.],.],[[[.,.],.],.]],.] => 15
[[[.,[.,[.,.]]],[.,[.,.]]],.] => 15
[[[.,[.,[.,.]]],[[.,.],.]],.] => 15
[[[.,[[.,.],.]],[.,[.,.]]],.] => 15
[[[.,[[.,.],.]],[[.,.],.]],.] => 15
[[[[.,.],[.,.]],[.,[.,.]]],.] => 14
[[[[.,.],[.,.]],[[.,.],.]],.] => 14
[[[[.,[.,.]],.],[.,[.,.]]],.] => 15
[[[[.,[.,.]],.],[[.,.],.]],.] => 15
[[[[[.,.],.],.],[.,[.,.]]],.] => 15
[[[[[.,.],.],.],[[.,.],.]],.] => 15
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[[[.,[[.,.],[.,.]]],[.,.]],.] => 16
[[[.,[[.,[.,.]],.]],[.,.]],.] => 17
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[[.,.],[[.,[.,[.,[.,[.,.]]]]],.]] => 22
[[.,.],[[.,[.,[.,[[.,.],.]]]],.]] => 22
[[.,.],[[.,[.,[[.,.],[.,.]]]],.]] => 21
[[.,.],[[.,[.,[[.,[.,.]],.]]],.]] => 22
[[.,.],[[.,[.,[[[.,.],.],.]]],.]] => 22
[[.,.],[[.,[[.,.],[.,[.,.]]]],.]] => 20
[[.,.],[[.,[[.,.],[[.,.],.]]],.]] => 20
[[.,.],[[.,[[.,[.,.]],[.,.]]],.]] => 20
[[.,.],[[.,[[[.,.],.],[.,.]]],.]] => 20
[[.,.],[[.,[[.,[.,[.,.]]],.]],.]] => 22
[[.,.],[[.,[[.,[[.,.],.]],.]],.]] => 22
[[.,.],[[.,[[[.,.],[.,.]],.]],.]] => 21
[[.,.],[[.,[[[.,[.,.]],.],.]],.]] => 22
[[.,.],[[.,[[[[.,.],.],.],.]],.]] => 22
[[.,.],[[[.,.],[.,[.,[.,.]]]],.]] => 19
[[.,.],[[[.,.],[.,[[.,.],.]]],.]] => 19
[[.,.],[[[.,.],[[.,.],[.,.]]],.]] => 18
[[.,.],[[[.,.],[[.,[.,.]],.]],.]] => 19
[[.,.],[[[.,.],[[[.,.],.],.]],.]] => 19
[[.,.],[[[.,[.,.]],[.,[.,.]]],.]] => 18
[[.,.],[[[.,[.,.]],[[.,.],.]],.]] => 18
[[.,.],[[[[.,.],.],[.,[.,.]]],.]] => 18
[[.,.],[[[[.,.],.],[[.,.],.]],.]] => 18
[[.,.],[[[.,[.,[.,.]]],[.,.]],.]] => 19
[[.,.],[[[.,[[.,.],.]],[.,.]],.]] => 19
[[.,.],[[[[.,.],[.,.]],[.,.]],.]] => 18
[[.,.],[[[[.,[.,.]],.],[.,.]],.]] => 19
[[.,.],[[[[[.,.],.],.],[.,.]],.]] => 19
[[.,.],[[[.,[.,[.,[.,.]]]],.],.]] => 22
[[.,.],[[[.,[.,[[.,.],.]]],.],.]] => 22
[[.,.],[[[.,[[.,.],[.,.]]],.],.]] => 21
[[.,.],[[[.,[[.,[.,.]],.]],.],.]] => 22
[[.,.],[[[.,[[[.,.],.],.]],.],.]] => 22
[[.,.],[[[[.,.],[.,[.,.]]],.],.]] => 20
[[.,.],[[[[.,.],[[.,.],.]],.],.]] => 20
[[.,.],[[[[.,[.,.]],[.,.]],.],.]] => 20
[[.,.],[[[[[.,.],.],[.,.]],.],.]] => 20
[[.,.],[[[[.,[.,[.,.]]],.],.],.]] => 22
[[.,.],[[[[.,[[.,.],.]],.],.],.]] => 22
[[.,.],[[[[[.,.],[.,.]],.],.],.]] => 21
[[.,.],[[[[[.,[.,.]],.],.],.],.]] => 22
[[.,.],[[[[[[.,.],.],.],.],.],.]] => 22
[[.,[.,.]],[.,[.,[.,[.,[.,.]]]]]] => 18
[[.,[.,.]],[.,[.,[.,[[.,.],.]]]]] => 18
[[.,[.,.]],[.,[.,[[.,.],[.,.]]]]] => 17
[[.,[.,.]],[.,[.,[[.,[.,.]],.]]]] => 18
[[.,[.,.]],[.,[.,[[[.,.],.],.]]]] => 18
[[.,[.,.]],[.,[[.,.],[.,[.,.]]]]] => 16
[[.,[.,.]],[.,[[.,.],[[.,.],.]]]] => 16
[[.,[.,.]],[.,[[.,[.,.]],[.,.]]]] => 16
[[.,[.,.]],[.,[[[.,.],.],[.,.]]]] => 16
[[.,[.,.]],[.,[[.,[.,[.,.]]],.]]] => 18
[[.,[.,.]],[.,[[.,[[.,.],.]],.]]] => 18
[[.,[.,.]],[.,[[[.,.],[.,.]],.]]] => 17
[[.,[.,.]],[.,[[[.,[.,.]],.],.]]] => 18
[[.,[.,.]],[.,[[[[.,.],.],.],.]]] => 18
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Description
The sum of the depths of the vertices (or total internal path length) of a binary tree.
The depth of a vertex is the number of edges to the tree's root, see Section 2.3.4.5 of [1] and [3].
This statistic is the very first entry of the OEIS, see [2]. Observe that there the term height is used instead.
References
[1] Knuth, D. E. The art of computer programming. Vol. 1 MathSciNet:3077152
[2] Normalized total height of all nodes in all rooted trees with n labeled nodes. OEIS:A000435
[3] wikipedia:Tree (data_structure)
Code
def statistic(T):
    return path_length_aux(T, 0)

def path_length_aux(T, n):
    return n+sum(path_length_aux(S, n+1) for S in T if not S.is_empty())

Created
Feb 22, 2016 at 15:54 by Martin Rubey
Updated
Aug 10, 2016 at 11:38 by Christian Stump