id:A023422 - OEIS Search Results

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Generalized Catalan Numbers.

+0
2

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; listen)

	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 this_sequence A084638 A157021 A006211` `Adjacent sequences: A023419 A023420 A023421 this_sequence A023423 A023424 A023425`
	KEYWORD	`nonn,easy`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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