id:A137610 - OEIS Search Results

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Self-convolution of A014062, where A014062(n) = C(n^2, n).

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1, 2, 13, 180, 3844, 110908, 4030740, 176640072, 9059743648, 532179428700, 35219852623888, 2592514449263656, 210072673380786552, 18579938909696752728, 1780987027765227959096, 183907984490301947455872 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n) = Sum_{k=0..n} C(k^2, k) * C((n-k)^2, n-k).`
	PROGRAM	`(PARI) a(n)=sum(k=0, n, binomial(k^2, k)*binomial((n-k)^2, n-k))`
	CROSSREFS	`Cf. A014062.` `Adjacent sequences: A137607 A137608 A137609 this_sequence A137611 A137612 A137613` `Sequence in context: A088316 A006905 A119400 this_sequence A073178 A062156 A049512`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Jan 29 2008`

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Last modified October 11 09:12 EDT 2008. Contains 144832 sequences.

AT&T Labs Research