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Identifier

St001586: Integer partitions ⟶ ℤ

Values

[1] => 0

[2] => 0

[1,1] => 0

[3] => 0

[2,1] => 1

[1,1,1] => 0

[4] => 0

[3,1] => 0

[2,2] => 0

[2,1,1] => 2

[1,1,1,1] => 0

[5] => 0

[4,1] => 1

[3,2] => 0

[3,1,1] => 0

[2,2,1] => 1

[2,1,1,1] => 3

[1,1,1,1,1] => 0

[6] => 0

[5,1] => 0

[4,2] => 0

[4,1,1] => 2

[3,3] => 0

[3,2,1] => 1

[3,1,1,1] => 0

[2,2,2] => 0

[2,2,1,1] => 2

[2,1,1,1,1] => 4

[1,1,1,1,1,1] => 0

[7] => 0

[6,1] => 1

[5,2] => 0

[5,1,1] => 0

[4,3] => 1

[4,2,1] => 1

[4,1,1,1] => 3

[3,3,1] => 0

[3,2,2] => 0

[3,2,1,1] => 2

[3,1,1,1,1] => 0

[2,2,2,1] => 1

[2,2,1,1,1] => 3

[2,1,1,1,1,1] => 5

[1,1,1,1,1,1,1] => 0

[8] => 0

[7,1] => 0

[6,2] => 0

[6,1,1] => 2

[5,3] => 0

[5,2,1] => 1

[5,1,1,1] => 0

[4,4] => 0

[4,3,1] => 2

[4,2,2] => 0

[4,2,1,1] => 2

[4,1,1,1,1] => 4

[3,3,2] => 0

[3,3,1,1] => 0

[3,2,2,1] => 1

[3,2,1,1,1] => 3

[3,1,1,1,1,1] => 0

[2,2,2,2] => 0

[2,2,2,1,1] => 2

[2,2,1,1,1,1] => 4

[2,1,1,1,1,1,1] => 6

[1,1,1,1,1,1,1,1] => 0

[9] => 0

[8,1] => 1

[7,2] => 0

[7,1,1] => 0

[6,3] => 1

[6,2,1] => 1

[6,1,1,1] => 3

[5,4] => 0

[5,3,1] => 0

[5,2,2] => 0

[5,2,1,1] => 2

[5,1,1,1,1] => 0

[4,4,1] => 1

[4,3,2] => 1

[4,3,1,1] => 3

[4,2,2,1] => 1

[4,2,1,1,1] => 3

[4,1,1,1,1,1] => 5

[3,3,3] => 0

[3,3,2,1] => 1

[3,3,1,1,1] => 0

[3,2,2,2] => 0

[3,2,2,1,1] => 2

[3,2,1,1,1,1] => 4

[3,1,1,1,1,1,1] => 0

[2,2,2,2,1] => 1

[2,2,2,1,1,1] => 3

[2,2,1,1,1,1,1] => 5

[2,1,1,1,1,1,1,1] => 7

[1,1,1,1,1,1,1,1,1] => 0

[10] => 0

[9,1] => 0

[8,2] => 0

[8,1,1] => 2

[7,3] => 0

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Description

The number of odd parts smaller than the largest even part in an integer partition.

Code

def statistic(la):
    e = max([Integer(0)] + [i for i in la if is_even(i)])
    return sum(Integer(1) for i in la if i < e and is_odd(i))

Created

Sep 07, 2020 at 14:32 by Martin Rubey

Updated

Sep 07, 2020 at 14:32 by Martin Rubey