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A089430
Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A082339/A082340.
0
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).
CROSSREFS
Sequence in context: A061056 A060777 A200744 * A337638 A213242 A243299
KEYWORD
nonn
AUTHOR
Antti Karttunen, Nov 29 2003
STATUS
approved