id:A137648 - OEIS Search Results

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a(n) = Sum_{k=0..n} C(k^2, k) * C(k^2, n-k).

+0
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1, 1, 7, 108, 2612, 85298, 3501504, 172989880, 9987924928, 659768790882, 49065577842538, 4056413252138692, 369030922581806616, 36634832808175143734, 3940779041158898056286, 456592594401713997379344 (list; graph; listen)

	OFFSET	`0,3`
	PROGRAM	`(PARI) a(n)=sum(k=0, n, binomial(k^2, k)*binomial(k^2, n-k))`
	CROSSREFS	`Sequence in context: A002687 A033516 A130629 this_sequence A106977 A142480 A096498` `Adjacent sequences: A137645 A137646 A137647 this_sequence A137649 A137650 A137651`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Jan 31 2008`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

AT&T Labs Research