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A089846
Number of cycles in range [
A014137
(n-1)..
A014138
(n-1)] of permutation
A089867
/
A089868
.
2
1, 1, 2, 5, 13, 35, 100, 296, 903, 2857, 9274, 30852, 104784, 362108, 1269324, 4502624, 16130539, 58271303, 212001890, 776027286, 2855731796
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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:
A107086
A294790
A234643
*
A258450
A131868
A339294
Adjacent sequences:
A089843
A089844
A089845
*
A089847
A089848
A089849
KEYWORD
nonn
AUTHOR
Antti Karttunen
, Dec 20 2003
STATUS
approved
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Last modified May 19 09:42 EDT 2024. Contains 372683 sequences. (Running on oeis4.)