%I
%S 0,1,6,42,52,385,414,477,506,555,4089,4180,4388,4479,4645,5095,5186,
%T 5394,5485,5651,5969,6060,6226,6502,47363,47661,48366,48664,49237,
%U 50800,51098,51803,52101,52674,53808,54106,54679,55681,59311,59609,60314
%N A014486indices of binary trees whose left and right subtree are identical.
%C Fixed points of permutation A069770. Diagonal of A072764 (and A072766).
%F a(0)=0, a(n)=A072764bi(n1, n1).
%Y a(n) = A080300(A083939(n)). Cf. A083940.
%K nonn
%O 0,3
%A _Antti Karttunen_ May 13 2003
