A089134 - OEIS

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A089134

a(n) = -a(n-1) - a(n-2) + a(n-3) - a(n-5).

0

-1, 0, 2, -3, 0, 6, -9, 1, 17, -27, 5, 48, -81, 21, 135, -242, 80, 378, -721, 288, 1053, -2142, 999, 2917, -6346, 3375, 8030, -18750, 11178, 21948, -55251, 36451, 59498, -162378, 117383, 159744, -475956, 374097, 423981, -1391417, 1181789, 1109565

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

Table of n, a(n) for n=1..42.

FORMULA

G.f.: -x*(1+x)*(1-x^2+x^3)/(1+x+x^2-x^3+x^5). - R. J. Mathar, Oct 24 2008

CROSSREFS

Sequence in context: A097287 A233672 A233670 * A349776 A305622 A269940

Adjacent sequences: A089131 A089132 A089133 * A089135 A089136 A089137

KEYWORD

sign,easy

AUTHOR

Roger L. Bagula, Dec 05 2003

STATUS

approved