id:A023430 - OEIS Search Results

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Generalized Catalan Numbers.

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1, 1, 1, 1, 1, 1, 1, 1, 2, 4, 7, 11, 17, 27, 44, 72, 118, 194, 320, 528, 871, 1439, 2385, 3965, 6605, 11017, 18399, 30771, 51538, 86440, 145165, 244085, 410890, 692442, 1168114, 1972470 (list; graph; listen)

	OFFSET	`0,9`
	MATHEMATICA	`Clear[ a ]; a[ 0 ]=1; a[ n_Integer ] := a[ n ]=a[ n-1 ]+Sum[ a[ k ]*a[ n-4-k ], {k, 4, n-4} ];`
	CROSSREFS	`Cf. A000108, A001006, A004148, A006318.` `Adjacent sequences: A023427 A023428 A023429 this_sequence A023431 A023432 A023433` `Sequence in context: A035295 A006999 A005252 this_sequence A023429 A023428 A093911`
	KEYWORD	`nonn,easy`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

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