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0,4

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

nonn

Antti Karttunen, Nov 29 2003

approved