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A089421
Number of cycles in range [
A014137
(n-1)..
A014138
(n-1)] of permutation
A082335
/
A082336
.
0
1, 1, 1, 2, 3, 9, 22, 71, 217, 729, 2438, 8440, 29414, 104138, 371516, 1337649, 4847637, 17680265, 64823110, 238824212, 883634026
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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:
A111360
A111238
A057832
*
A151825
A294910
A111240
Adjacent sequences:
A089418
A089419
A089420
*
A089422
A089423
A089424
KEYWORD
nonn
AUTHOR
Antti Karttunen
, Nov 29 2003
STATUS
approved
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Last modified September 19 12:50 EDT 2024. Contains 376012 sequences. (Running on oeis4.)