id:A163661 - OEIS Search Results

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a(n) = n*(2*n^2+5*n+17)/2.

+0
2

0, 12, 35, 75, 138, 230, 357, 525, 740, 1008, 1335, 1727, 2190, 2730, 3353, 4065, 4872, 5780, 6795, 7923, 9170, 10542, 12045, 13685, 15468, 17400, 19487, 21735, 24150, 26738, 29505, 32457, 35600, 38940, 42483, 46235, 50202, 54390, 58805, 63453 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Row sums from A163657`
	FORMULA	`a(m) = sum_(n=1,...,m) A163657(m,n) = A163655(m)+2m.` `a(n) = 4a(n-1)-6a(n-2)+4a(n-3)-a(n-4). G.f.: x(12-13x+7*x^2)/(x-1)^4.`
	CROSSREFS	`Cf. A153047, A163657` `Sequence in context: A077293 A053682 A033570 this_sequence A142074 A102085 A058968` `Adjacent sequences: A163658 A163659 A163660 this_sequence A163662 A163663 A163664`
	KEYWORD	`nonn,easy`
	AUTHOR	`Vincenzo Librandi (vincenzo.librandi(AT)ti.it), Aug 02 2009`
	EXTENSIONS	`Edited, a(31) corrected - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 05 2009`

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Last modified November 23 17:05 EST 2009. Contains 167421 sequences.

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