id:A137647 - OEIS Search Results

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

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1, 2, 19, 312, 7710, 254226, 10490141, 519862812, 30075235131, 1989376821840, 148089577059957, 12251856625291758, 1115218087275339166, 110758226370052793778, 11918195995470354683205 (list; graph; listen)

	OFFSET	`0,2`
	PROGRAM	`(PARI) a(n)=sum(k=0, n, binomial(k(k+1), k)binomial(k*(k+1), n-k))`
	CROSSREFS	`Sequence in context: A065923 A094476 A119773 this_sequence A078369 A090308 A110818` `Adjacent sequences: A137644 A137645 A137646 this_sequence A137648 A137649 A137650`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Jan 31 2008`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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