A137610 - OEIS

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A137610

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

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

	OFFSET	`0,2`
	FORMULA	`a(n) = Sum_{k=0..n} C(k^2, k) * C((n-k)^2, n-k).`
	PROG	`(PARI) a(n)=sum(k=0, n, binomial(k^2, k)*binomial((n-k)^2, n-k))`
	CROSSREFS	`Cf. A014062.` `Sequence in context: A006905 A119400 A183606 * A073178 A193192 A062156` `Adjacent sequences: A137607 A137608 A137609 * A137611 A137612 A137613`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Jan 29 2008`

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.