A083938 - OEIS

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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 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	COMMENTS	`Fixed points of permutation A069770. Diagonal of A072764 (and A072766).`
	FORMULA	`a(0)=0, a(n)=A072764bi(n-1, n-1).`
	CROSSREFS	`a(n) = A080300(A083939(n)). Cf. A083940.` `Sequence in context: A153243 A186885 A097253 * A176308 A103763 A191764` `Adjacent sequences: A083935 A083936 A083937 * A083939 A083940 A083941`
	KEYWORD	`nonn`
	AUTHOR	`Antti Karttunen (MyFirstname.MySurname(AT)iki.fi) May 13 2003`

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Last modified February 17 11:18 EST 2012. Contains 206011 sequences.