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The number of orbits to which the corresponding automorphism(s) partitions the set of A000108(n) binary trees with n internal nodes.
Table of n, a(n) for n=0..20.
A. Karttunen, C-program for computing the initial terms of this sequence
Sequence in context: A206464 A089429 A049143 * A006123 A006251 A049401
Adjacent sequences: A089401 A089402 A089403 * A089405 A089406 A089407
Antti Karttunen, Nov 29 2003