A030053 - OEIS

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A030053

C(2n+1,n-3).

1, 9, 55, 286, 1365, 6188, 27132, 116280, 490314, 2042975, 8436285, 34597290, 141120525, 573166440, 2319959400, 9364199760, 37711260990, 151584480450, 608359048206, 2438362177020, 9762479679106 (list; graph; refs; listen; history; internal format)

	OFFSET	`3,2`
	LINKS	`Milan Janjic, Two Enumerative Functions`
	MAPLE	`seq((count(Composition(2*n), size=n-3)), n=4..24); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 03 2007`
	CROSSREFS	`Diagonal 8 of triangle A100257.` `Sequence in context: A141530 A016269 A005770 * A072844 A026857 A097790` `Adjacent sequences: A030050 A030051 A030052 * A030054 A030055 A030056`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 16 07:39 EST 2012. Contains 205881 sequences.