id:A137644 - OEIS Search Results

Search: id:A137644

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a(n) = Sum_{k=0..n} C(n+k,k)*C(n+k,n-k).

+0
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1, 3, 16, 95, 591, 3780, 24620, 162423, 1081780, 7258053, 48982176, 332140328, 2261099491, 15444137880, 105789736896, 726426836103, 4998885106599, 34464824536500, 238017084356680, 1646234203000485, 11401464090042224 (list; graph; listen)

	OFFSET	`0,2`
	PROGRAM	`(PARI) a(n)=sum(k=0, n, binomial(n+k, k)*binomial(n+k, n-k))`
	CROSSREFS	`Sequence in context: A067679 A099952 A074555 this_sequence A114174 A006347 A000270` `Adjacent sequences: A137641 A137642 A137643 this_sequence A137645 A137646 A137647`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Jan 31 2008`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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