A131974 - OEIS

A131974

Period 8: repeat [1, 2, 3, 4, -5, -4, -3, -2].

1, 2, 3, 4, -5, -4, -3, -2, 1, 2, 3, 4, -5, -4, -3, -2, 1, 2, 3, 4, -5, -4, -3, -2, 1, 2, 3, 4, -5, -4, -3, -2, 1, 2, 3, 4, -5, -4, -3, -2, 1, 2, 3, 4, -5, -4, -3, -2, 1, 2, 3, 4, -5, -4, -3, -2, 1, 2, 3, 4, -5, -4, -3, -2, 1, 2, 3, 4, -5, -4, -3, -2

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..71.

Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,1).

FORMULA

G.f.: (1 + 2*x + 3*x^2 + 4*x^3 - 5*x^4 - 4*x^5 - 3*x^6 - 2*x^7)/(1-x^8). - Wesley Ivan Hurt, Aug 31 2019

a(n) = a(n-8). - Wesley Ivan Hurt, Nov 28 2021

MATHEMATICA

CoefficientList[Series[(1 + 2*x + 3*x^2 + 4*x^3 - 5*x^4 - 4*x^5 - 3*x^6 - 2*x^7)/(1 - x^8), {x, 0, 80}], x] (* Wesley Ivan Hurt, Aug 31 2019 *)

PadRight[{}, 120, {1, 2, 3, 4, -5, -4, -3, -2}] (* Harvey P. Dale, Aug 10 2022 *)

PROG

(PARI) a(n)=[1, 2, 3, 4, -5, -4, -3, -2][n%8+1] \\ Charles R Greathouse IV, Jun 02 2011

CROSSREFS

Sequence in context: A035343 A017880 A086144 * A181975 A062406 A271800

Adjacent sequences: A131971 A131972 A131973 * A131975 A131976 A131977

KEYWORD

sign,easy,less

AUTHOR

Paul Curtz, Oct 06 2007

STATUS

approved