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A089876 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A071667/A071668. 0
1, 1, 1, 2, 3, 14, 22, 62, 127, 320, 756, 1888, 4440, 10996, 26784, 67004, 166449, 417848, 1041262, 2596506, 6427116 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

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: A024478 A025090 A024603 * A025092 A112636 A124663

Adjacent sequences:  A089873 A089874 A089875 * A089877 A089878 A089879

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 29 2003

STATUS

approved

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Last modified December 3 10:49 EST 2016. Contains 278699 sequences.