Identifier
- St000385: Binary trees ⟶ ℤ
Values
=>
Cc0010;cc-rep
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[[.,.],[[.,[.,[.,[[.,.],.]]]],.]]=>5
[[.,.],[[.,[.,[[.,.],[.,.]]]],.]]=>3
[[.,.],[[.,[.,[[.,[.,.]],.]]],.]]=>5
[[.,.],[[.,[.,[[[.,.],.],.]]],.]]=>5
[[.,.],[[.,[[.,.],[.,[.,.]]]],.]]=>3
[[.,.],[[.,[[.,.],[[.,.],.]]],.]]=>3
[[.,.],[[.,[[.,[.,.]],[.,.]]],.]]=>3
[[.,.],[[.,[[[.,.],.],[.,.]]],.]]=>3
[[.,.],[[.,[[.,[.,[.,.]]],.]],.]]=>5
[[.,.],[[.,[[.,[[.,.],.]],.]],.]]=>5
[[.,.],[[.,[[[.,.],[.,.]],.]],.]]=>3
[[.,.],[[.,[[[.,[.,.]],.],.]],.]]=>5
[[.,.],[[.,[[[[.,.],.],.],.]],.]]=>5
[[.,.],[[[.,.],[.,[.,[.,.]]]],.]]=>3
[[.,.],[[[.,.],[.,[[.,.],.]]],.]]=>3
[[.,.],[[[.,.],[[.,.],[.,.]]],.]]=>1
[[.,.],[[[.,.],[[.,[.,.]],.]],.]]=>3
[[.,.],[[[.,.],[[[.,.],.],.]],.]]=>3
[[.,.],[[[.,[.,.]],[.,[.,.]]],.]]=>3
[[.,.],[[[.,[.,.]],[[.,.],.]],.]]=>3
[[.,.],[[[[.,.],.],[.,[.,.]]],.]]=>3
[[.,.],[[[[.,.],.],[[.,.],.]],.]]=>3
[[.,.],[[[.,[.,[.,.]]],[.,.]],.]]=>3
[[.,.],[[[.,[[.,.],.]],[.,.]],.]]=>3
[[.,.],[[[[.,.],[.,.]],[.,.]],.]]=>1
[[.,.],[[[[.,[.,.]],.],[.,.]],.]]=>3
[[.,.],[[[[[.,.],.],.],[.,.]],.]]=>3
[[.,.],[[[.,[.,[.,[.,.]]]],.],.]]=>5
[[.,.],[[[.,[.,[[.,.],.]]],.],.]]=>5
[[.,.],[[[.,[[.,.],[.,.]]],.],.]]=>3
[[.,.],[[[.,[[.,[.,.]],.]],.],.]]=>5
[[.,.],[[[.,[[[.,.],.],.]],.],.]]=>5
[[.,.],[[[[.,.],[.,[.,.]]],.],.]]=>3
[[.,.],[[[[.,.],[[.,.],.]],.],.]]=>3
[[.,.],[[[[.,[.,.]],[.,.]],.],.]]=>3
[[.,.],[[[[[.,.],.],[.,.]],.],.]]=>3
[[.,.],[[[[.,[.,[.,.]]],.],.],.]]=>5
[[.,.],[[[[.,[[.,.],.]],.],.],.]]=>5
[[.,.],[[[[[.,.],[.,.]],.],.],.]]=>3
[[.,.],[[[[[.,[.,.]],.],.],.],.]]=>5
[[.,.],[[[[[[.,.],.],.],.],.],.]]=>5
[[.,[.,.]],[.,[.,[.,[.,[.,.]]]]]]=>5
[[.,[.,.]],[.,[.,[.,[[.,.],.]]]]]=>5
[[.,[.,.]],[.,[.,[[.,.],[.,.]]]]]=>3
[[.,[.,.]],[.,[.,[[.,[.,.]],.]]]]=>5
[[.,[.,.]],[.,[.,[[[.,.],.],.]]]]=>5
[[.,[.,.]],[.,[[.,.],[.,[.,.]]]]]=>3
[[.,[.,.]],[.,[[.,.],[[.,.],.]]]]=>3
[[.,[.,.]],[.,[[.,[.,.]],[.,.]]]]=>3
[[.,[.,.]],[.,[[[.,.],.],[.,.]]]]=>3
[[.,[.,.]],[.,[[.,[.,[.,.]]],.]]]=>5
[[.,[.,.]],[.,[[.,[[.,.],.]],.]]]=>5
[[.,[.,.]],[.,[[[.,.],[.,.]],.]]]=>3
[[.,[.,.]],[.,[[[.,[.,.]],.],.]]]=>5
[[.,[.,.]],[.,[[[[.,.],.],.],.]]]=>5
[[.,[.,.]],[[.,.],[.,[.,[.,.]]]]]=>3
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Description
The number of vertices with out-degree 1 in a binary tree.
See the references for several connections of this statistic.
In particular, the number $T(n,k)$ of binary trees with $n$ vertices and $k$ out-degree $1$ vertices is given by $T(n,k) = 0$ for $n-k$ odd and
$$T(n,k)=\frac{2^k}{n+1}\binom{n+1}{k}\binom{n+1-k}{(n-k)/2}$$
for $n-k$ is even.
See the references for several connections of this statistic.
In particular, the number $T(n,k)$ of binary trees with $n$ vertices and $k$ out-degree $1$ vertices is given by $T(n,k) = 0$ for $n-k$ odd and
$$T(n,k)=\frac{2^k}{n+1}\binom{n+1}{k}\binom{n+1-k}{(n-k)/2}$$
for $n-k$ is even.
References
[1] Triangle read by rows: T(n,k) is the number of binary trees with n edges and having k vertices of outdegree 1 (n>=0, k>=0). A binary tree is a rooted tree in which each vertex has at most two children and each child of a vertex is designated as its left or right child. OEIS:A121448
[2] Copeland, T. Has anyone seen these binary trees (Catalan-type related to the Gegenbauer polynomials and Motzkin paths)? MathOverflow:230714
[2] Copeland, T. Has anyone seen these binary trees (Catalan-type related to the Gegenbauer polynomials and Motzkin paths)? MathOverflow:230714
Code
def statistic(tree): return tree.graph(with_leaves=False).out_degree_sequence().count(1)
Created
Feb 10, 2016 at 09:37 by Christian Stump
Updated
Feb 10, 2016 at 09:57 by Christian Stump
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