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A089844 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A089865/A089866. 2
1, 1, 2, 4, 9, 23, 68, 205, 655, 2147, 7218, 24686, 85760, 301458, 1070820, 3836693, 13851191, 50333389, 183965474, 675825400, 2494114694 (list; graph; refs; listen; history; text; internal format)
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: A026898 A088930 A225588 * A113997 A125789 A058731

Adjacent sequences:  A089841 A089842 A089843 * A089845 A089846 A089847

KEYWORD

nonn

AUTHOR

Antti Karttunen, Dec 20 2003

STATUS

approved

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Last modified December 9 03:27 EST 2019. Contains 329872 sequences. (Running on oeis4.)