A089430 Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A082339/A082340.

1, 1, 2, 3, 6, 12, 30, 79, 232, 716, 2318, 7714, 26270, 90944, 319146, 1132185, 4053618, 14626828, 53136324, 194174324, 713267792

Offset

0,3

Comments

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

Links

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

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

Crossrefs

Sequence in context: A061056 A060777 A200744 * A337638 A213242 A243299

Adjacent sequences: A089427 A089428 A089429 * A089431 A089432 A089433

Keyword

nonn

Author

Antti Karttunen, Nov 29 2003

Status

approved