A023423 - OEIS

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A023423

Generalized Catalan Numbers.

1, 1, 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 128, 257, 517, 1042, 2104, 4256, 8624, 17504, 35585, 72455, 147746, 301706, 616948, 1263240, 2589840, 5316033, 10924681, 22475831, 46290195 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,8`
	MATHEMATICA	`Clear[ a ]; a[ 0 ]=1; a[ n_Integer ] := a[ n ]=a[ n-1 ]+Sum[ a[ k ]*a[ n-2-k ], {k, 5, n-2} ];`
	CROSSREFS	`Cf. A000108, A004148, A004149.` `Sixth row of A064645.` `Sequence in context: A103662 A180211 A186026 * A180210 A079838 A109912` `Adjacent sequences: A023420 A023421 A023422 * A023424 A023425 A023426`
	KEYWORD	`nonn,easy`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

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Last modified February 15 10:06 EST 2012. Contains 205763 sequences.