A089877 Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A071667/A071668.

1, 1, 0, 0, 0, 5, 0, 0, 0, 5, 0, 10, 0, 5, 0, 10, 0, 45, 0, 10, 0

Offset

0,6

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: A243829 A329639 A318952 * A278715 A333947 A368662

Adjacent sequences: A089874 A089875 A089876 * A089878 A089879 A089880

Keyword

nonn

Author

Antti Karttunen, Nov 29 2003

Status

approved