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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: A024478 A025090 A024603 * A025092 A112636 A124663
Adjacent sequences: A089873 A089874 A089875 * A089877 A089878 A089879
Antti Karttunen, Nov 29 2003