0,3

The number of n-node binary trees fixed by the corresponding automorphism(s).

Table of n, a(n) for n=0..20.

A. Karttunen, C-program for computing the initial terms of this sequence

Sequence in context: A274496 A112801 A173862 * A275433 A096323 A282562

Adjacent sequences: A089870 A089871 A089872 * A089874 A089875 A089876

nonn

Antti Karttunen, Nov 29 2003

approved