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A083938 A014486-indices of binary trees whose left and right subtree are identical. 3

%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 A014486-indices 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(n-1, n-1).

%Y a(n) = A080300(A083939(n)). Cf. A083940.

%K nonn

%O 0,3

%A _Antti Karttunen_ May 13 2003

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Last modified July 5 00:01 EDT 2020. Contains 335457 sequences. (Running on oeis4.)