A077856 - OEIS

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A077856

Expansion of (1-x)^(-1)/(1-2*x+x^2+x^3).

1, 3, 6, 9, 10, 6, -6, -27, -53, -72, -63, 0, 136, 336, 537, 603, 334, -471, -1878, -3618, -4886, -4275, -45, 9072, 22465, 35904, 40272, 22176, -31823, -126093, -242538, -327159, -285686, -1674, 609498, 1506357, 2404891, 2693928, 1476609, -2145600, -8461736, -16254480, -21901623 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`a(n) = Sum_{k=1..floor(n/3+1)} (-1)^kbinomial(n-k+3, 2k). - Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 10 2003`
	CROSSREFS	`Cf. A078001.` `Sequence in context: A007844 A159785 A057338 * A074499 A081605 A110263` `Adjacent sequences: A077853 A077854 A077855 * A077857 A077858 A077859`
	KEYWORD	`sign`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002`

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Last modified February 16 07:35 EST 2012. Contains 205876 sequences.