A090827 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A089869/A089870.

1, 1, 2, 5, 13, 34, 91, 245, 659, 1786, 4846, 13182, 35962, 98418, 270121, 743533, 2052073, 5678238, 15750382, 43793198, 122042214

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: A304173 A217896 A360709 * A109192 A192313 A193039

Adjacent sequences: A090824 A090825 A090826 * A090828 A090829 A090830

Keyword

nonn

Author

Antti Karttunen, Dec 20 2003

Status

approved