A090828 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A085163/A085164.

1, 1, 2, 3, 7, 14, 37, 95, 285, 876, 2862, 9582, 33022, 115454, 409721, 1467781, 5305211, 19302774, 70662612, 259980148, 960908596

Offset

0,3

Comments

The number of orbits to which the corresponding automorphism(s) partitions the set of A000108(n) binary trees with n internal nodes.

Links

Table of n, a(n) for n=0..20.

A. Karttunen, C-program for computing the initial terms of this sequence

Crossrefs

Sequence in context: A123777 A245899 A246747 * A296416 A049367 A089790

Adjacent sequences: A090825 A090826 A090827 * A090829 A090830 A090831

Keyword

nonn

Author

Antti Karttunen, Dec 20 2003

Status

approved