id:A077984 - OEIS Search Results

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

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1

1, -2, 6, -18, 52, -152, 444, -1296, 3784, -11048, 32256, -94176, 274960, -802784, 2343840, -6843168, 19979584, -58333184, 170311872, -497249280, 1451788672, -4238699648, 12375475200, -36131927040, 105492203776, -307999212032, 899246685696, -2625476203008, 7665444201472 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n) = -2a(n-1) + 2a(n-2) - 2a(n-3).` `a(n) is the nearest integer to cd^n where c=0.7166689603... satisfies 67c^3-67c^2+15c-1=0 and d=-2.9196395658... satisfies d^3+2d^2-2*d+2=0.`
	CROSSREFS	`Sequence in context: A156989 A077935 A077835 this_sequence A052979 A005507 A094864` `Adjacent sequences: A077981 A077982 A077983 this_sequence A077985 A077986 A077987`
	KEYWORD	`sign`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002`

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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.

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