id:A023428 - OEIS Search Results

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Generalized Catalan Numbers.

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1, 1, 1, 1, 1, 1, 2, 4, 7, 11, 17, 27, 45, 77, 132, 224, 378, 640, 1093, 1881, 3250, 5622, 9732, 16874, 29332, 51126, 89313, 156283, 273842, 480474, 844220, 1485472, 2617335, 4617243 (list; graph; listen)

	OFFSET	`0,7`
	MATHEMATICA	`Clear[ a ]; a[ 0 ]=1; a[ n_Integer ] := a[ n ]=a[ n-1 ]+Sum[ a[ k ]*a[ n-4-k ], {k, 2, n-4} ];`
	CROSSREFS	`Cf. A000108, A001006, A004148, A006318.` `Sequence in context: A005252 A023430 A023429 this_sequence A093911 A152398 A023427` `Adjacent sequences: A023425 A023426 A023427 this_sequence A023429 A023430 A023431`
	KEYWORD	`nonn,easy`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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