id:A023423 - OEIS Search Results

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Generalized Catalan Numbers.

+0
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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; listen)

	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: A050732 A138815 A103662 this_sequence A079838 A109912 A079845` `Adjacent sequences: A023420 A023421 A023422 this_sequence A023424 A023425 A023426`
	KEYWORD	`nonn,easy`
	AUTHOR	`Olivier Gerard (ogerard(AT)ext.jussieu.fr)`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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