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A117666 Expansion of -(x^2-3*x+1)*(x^2+x-1) / ((x^2+x+1)*(x^2-x+1)*(x-1)^2). 0
1, -2, -3, 2, 3, 2, 3, 0, -1, 4, 5, 4, 5, 2, 1, 6, 7, 6, 7, 4, 3, 8, 9, 8, 9, 6, 5, 10, 11, 10, 11, 8, 7, 12, 13, 12, 13, 10, 9, 14, 15, 14, 15, 12, 11, 16, 17, 16, 17, 14, 13, 18, 19, 18, 19, 16, 15, 20, 21, 20, 21, 18, 17, 22, 23, 22, 23, 20, 19, 24, 25, 24, 25, 22, 21, 26, 27, 26, 27, 24, 23, 28, 29, 28, 29, 26, 25 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Colin Barker, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (2,-2,2,-2,2,-1).

FORMULA

a(n) = 2*a(n-1) - 2*a(n-2) + 2*a(n-3) - 2*a(n-4) + 2*a(n-5) - a(n-6) for n>5. - Colin Barker, May 18 2019

PROG

(PARI) Vec((1 - 3*x + x^2)*(1 - x - x^2) / ((1 - x)^2*(1 - x + x^2)*(1 + x + x^2)) + O(x^80)) \\ Colin Barker, May 18 2019

CROSSREFS

Cf. A104161, A001595.

Sequence in context: A066102 A036048 A145384 * A274921 A274821 A275720

Adjacent sequences:  A117663 A117664 A117665 * A117667 A117668 A117669

KEYWORD

easy,sign,changed

AUTHOR

Creighton Dement, Apr 11 2006

STATUS

approved

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Last modified May 19 22:32 EDT 2019. Contains 323411 sequences. (Running on oeis4.)