id:A038629 - OEIS Search Results

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Convolution of Catalan numbers A000108 with Catalan numbers but C(0)=1 replaced by 3.

+0
4

3, 4, 9, 24, 70, 216, 693, 2288, 7722, 26520, 92378, 325584, 1158924, 4160240, 15043725, 54747360, 200360130, 736928280, 2722540590, 10098646800, 37594507860, 140415097680, 526024740930, 1976023374624, 7441754696100 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`a(n) = 6binomial(2n, n)/(n+2) = C(n+1)+2C(n), C(n): Catalan numbers, G.f. c(x)(c(x)+2), c(x): G.f. for Catalan numbers`
	CROSSREFS	`Cf. A000108.` `Sequence in context: A089243 A034921 A038222 this_sequence A105229 A080849 A058857` `Adjacent sequences: A038626 A038627 A038628 this_sequence A038630 A038631 A038632`
	KEYWORD	`easy,nonn`
	AUTHOR	`wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de)`

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Last modified November 24 14:25 EST 2009. Contains 167438 sequences.

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