A023427 - OEIS

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A023427

Generalized Catalan Numbers.

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; refs; listen; history; internal format)

	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 * A202847 A129929 A073738` `Adjacent sequences: A023424 A023425 A023426 * A023428 A023429 A023430`
	KEYWORD	`nonn,easy`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

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Last modified February 16 17:11 EST 2012. Contains 205938 sequences.