A089430 - OEIS

%I #5 Mar 31 2012 14:02:17

%S 1,1,2,3,6,12,30,79,232,716,2318,7714,26270,90944,319146,1132185,

%T 4053618,14626828,53136324,194174324,713267792

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

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

%H A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a>

%K nonn

%O 0,3

%A _Antti Karttunen_, Nov 29 2003