A023422 - OEIS

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A023422

Generalized Catalan Numbers.

1, 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 129, 261, 530, 1080, 2208, 4528, 9313, 19207, 39714, 82314, 170996, 355976, 742545, 1551817, 3248823, 6812947, 14309557, 30099645, 63402315 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,7`
	MATHEMATICA	`Clear[ a ]; a[ 0 ]=1; a[ n_Integer ] := a[ n ]=a[ n-1 ]+Sum[ a[ k ]*a[ n-2-k ], {k, 4, n-2} ];`
	CROSSREFS	`Cf. A000108, A004148, A004149.` `Fifth row of A064645.` `Sequence in context: A109912 A079845 A117302 * A084638 A157021 A006211` `Adjacent sequences: A023419 A023420 A023421 * A023423 A023424 A023425`
	KEYWORD	`nonn,easy`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

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Last modified February 14 18:47 EST 2012. Contains 205663 sequences.