A120707 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A120705/A120706.

1, 1, 1, 2, 3, 6, 10, 20, 39, 72, 138, 286, 512

Offset

0,4

Comments

The number of orbits to which the corresponding automorphisms partition the set of A000108(n) binary trees of n internal nodes.

Links

Table of n, a(n) for n=0..12.

Crossrefs

Sequence in context: A005195 A228835 A052843 * A047111 A106741 A068991

Adjacent sequences: A120704 A120705 A120706 * A120708 A120709 A120710

Keyword

nonn

Author

Antti Karttunen, Jun 28 2006

Status

approved