A077894 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A077894

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

1, 1, -1, -2, 2, 6, -1, -13, -3, 28, 20, -52, -67, 85, 187, -102, -458, 18, 1019, 423, -2055, -1864, 3688, 5784, -5511, -15255, 5239, 36022, 4778, -77282, -45577, 149787, 168437, -253996, -486660, 339556, 1227317, -192451, -2794189, -842414, 5780830, 4479018, -10719245, -14738865

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

OFFSET

0,4

LINKS

Table of n, a(n) for n=0..43.

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

FORMULA

a(0)=1, a(1)=1, a(2)=-1, a(3)=-2, a(n)=a(n-1)-2*a(n-2)+a(n-3)+a(n-4). - Harvey P. Dale, Feb 06 2015

MATHEMATICA

CoefficientList[Series[(1-x)^(-1)/(1+2x^2+x^3), {x, 0, 50}], x] (* or *) LinearRecurrence[{1, -2, 1, 1}, {1, 1, -1, -2}, 50] (* Harvey P. Dale, Feb 06 2015 *)

CROSSREFS

Sequence in context: A248617 A225975 A016529 * A374031 A053214 A077198

Adjacent sequences: A077891 A077892 A077893 * A077895 A077896 A077897

KEYWORD

sign

AUTHOR

N. J. A. Sloane, Nov 17 2002

STATUS

approved