id:A023425 - OEIS Search Results

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Generalized Catalan Numbers.

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1, 1, 1, 1, 1, 2, 5, 13, 34, 90, 241, 652, 1780, 4899, 13581, 37893, 106340, 299978, 850187, 2419788, 6913658, 19822439, 57015620, 164476023, 475752469, 1379553027, 4009532279 (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-k ], {k, 1, n-4} ];`
	CROSSREFS	`Cf. A000108, A001006, A004148, A006318.` `Sequence in context: A097417 A006801 A114173 this_sequence A090827 A109192 A062465` `Adjacent sequences: A023422 A023423 A023424 this_sequence A023426 A023427 A023428`
	KEYWORD	`nonn,easy`
	AUTHOR	`Olivier Gerard (ogerard(AT)ext.jussieu.fr)`

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Last modified July 25 02:12 EDT 2008. Contains 142294 sequences.

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