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

0, 1, 6, 42, 52, 385, 414, 477, 506, 555, 4089, 4180, 4388, 4479, 4645, 5095, 5186, 5394, 5485, 5651, 5969, 6060, 6226, 6502, 47363, 47661, 48366, 48664, 49237, 50800, 51098, 51803, 52101, 52674, 53808, 54106, 54679, 55681, 59311, 59609, 60314

Offset: 0

Author

Antti Karttunen, May 13 2003

Keywords

• nonn

Comments

Fixed points of permutation A069770. Diagonal of A072764 (and A072766).

Crossrefs

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

Formula

a(0)=0, a(n)=A072764bi(n-1, n-1).