id:A081917 - OEIS Search Results

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A081917

a(0)=1, a(n)= n^(n-2)(7n^2-3n+2)/6 (n>0).

+0
1

1, 1, 4, 28, 272, 3375, 50976, 907578, 18612224, 432061533, 11200000000, 320680885976, 10051252125696, 342302635261067, 12586048547315712, 496928474121093750, 20968759865037029376, 941737183946729395897 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Main diagonal of square array defined by T(n,k)=k^n(n^3-3n^2+2n+6k^3)/(6k^3), in which rows have g.f. (1-3kx+3k^2x^2-(k^3-1)x^3)/(1-kx)^4.`
	CROSSREFS	`Cf. A050407, A081913, A081914, A081915, A081916.` `Sequence in context: A138272 A112915 A129683 this_sequence A128318 A032274 A007559` `Adjacent sequences: A081914 A081915 A081916 this_sequence A081918 A081919 A081920`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 31 2003`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

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