id:A156894 - OEIS Search Results

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a(n)=sum{k=0..n, C(n,k)*C(2n+k-1,k)}.

+0
1

1, 3, 19, 138, 1059, 8378, 67582, 552576, 4563235, 37972290, 317894394, 2674398268, 22590697614, 191475925332, 1627653567916, 13870754053388, 118464647799075, 1013709715774130, 8689197042438274, 74594573994750972 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=[x^n]((1+x)/(1-x)^2)^n.`
	CROSSREFS	`Cf.: A123164, A114496.` `Sequence in context: A094661 A094662 A115750 this_sequence A073515 A074559 A027314` `Adjacent sequences: A156891 A156892 A156893 this_sequence A156895 A156896 A156897`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 17 2009`

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Last modified November 25 14:49 EST 2009. Contains 167514 sequences.

AT&T Labs Research