OFFSET
0,3
LINKS
Index entries for linear recurrences with constant coefficients, signature (-1,1,3,-2).
FORMULA
a(0)=1, a(1)=-1, a(2)=2, a(3)=0, a(n) = -a(n-1)+a(n-2)+3*a(n-3)-2*a(n-4). [Harvey P. Dale, May 09 2012]
MATHEMATICA
CoefficientList[Series[(1-x)^(-1)/(1+2 x+x^2-2 x^3), {x, 0, 40}], x] (* or *) LinearRecurrence[{-1, 1, 3, -2}, {1, -1, 2, 0}, 40] (* Harvey P. Dale, May 09 2012 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
N. J. A. Sloane, Nov 17 2002
STATUS
approved