id:A107652 - OEIS Search Results

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Triangle of numbers arising in enumeration of binary trees.

+0
3

1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 4, 8, 10, 8, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 34, 68, 94, 104, 94, 68, 34, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 496, 992, 1420, 1712, 1816, 1712, 1420, 992, 496, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; table; graph; listen)

	OFFSET	`0,13`
	REFERENCES	`C. Poupard, Deux proprietes des arbres binaires ordonnes stricts, European J. Combin., 10 (1989), 369-374.`
	FORMULA	`Essentially the same triangle as in A008301, but with more zeros.`
	CROSSREFS	`Cf. A008301. Leading diagonal and row sums = (essentially) A107652.` `Sequence in context: A056620 A037860 A037878 this_sequence A067150 A017887 A037859` `Adjacent sequences: A107649 A107650 A107651 this_sequence A107653 A107654 A107655`
	KEYWORD	`nonn,tabl,easy`
	AUTHOR	`njas`

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Last modified December 2 15:58 EST 2008. Contains 150992 sequences.

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