id:A023427 - OEIS Search Results

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Generalized Catalan Numbers.

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1, 1, 1, 1, 1, 2, 4, 7, 11, 17, 28, 49, 87, 152, 262, 453, 794, 1408, 2507, 4462, 7943, 14179, 25415, 45713, 82398, 148731, 268859, 486890, 883411, 1605582, 2922259, 5325377, 9716564 (list; graph; listen)

	OFFSET	`0,6`
	MATHEMATICA	`Clear[ a ]; a[ 0 ]=1; a[ n_Integer ] := a[ n ]=a[ n-1 ]+Sum[ a[ k ]*a[ n-4-k ], {k, 1, n-4} ];`
	CROSSREFS	`Cf. A000108, A001006, A004148, A006318.` `Sequence in context: A023428 A093911 A152398 this_sequence A129929 A073738 A137631` `Adjacent sequences: A023424 A023425 A023426 this_sequence A023428 A023429 A023430`
	KEYWORD	`nonn,easy`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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