Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 4500 articles have referenced us, often saying "we would not have discovered this result without the OEIS".
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