id:A023421 - OEIS Search Results

Search: id:A023421

Displaying 1-1 of 1 results found.

page 1

Generalized Catalan Numbers.

+0
2

1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 65, 133, 274, 568, 1184, 2481, 5223, 11042, 23434, 49908, 106633, 228505, 490999, 1057683, 2283701, 4941502, 10713941, 23272929, 50642017, 110377543 (list; graph; listen)

	OFFSET	`0,6`
	MATHEMATICA	`Clear[ a ]; a[ 0 ]=1; a[ n_Integer ] := a[ n ]=a[ n-1 ]+Sum[ a[ k ]*a[ n-2-k ], {k, 3, n-2} ];`
	CROSSREFS	`Cf. A000108, A004148, A004149.` `Fourth row of A064645.` `Sequence in context: A157021 A006211 A101333 this_sequence A098051 A084637 A100137` `Adjacent sequences: A023418 A023419 A023420 this_sequence A023422 A023423 A023424`
	KEYWORD	`nonn,easy`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

page 1

Search completed in 0.002 seconds

Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

AT&T Labs Research