OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (2,-2,0,1).
FORMULA
a(n) = 2*a(n-1) - 2*a(n-2) + a(n-4) for n>3. - Colin Barker, Jun 20 2017
MATHEMATICA
CoefficientList[Series[1/((1-x)(1-x+x^2+x^3)), {x, 0, 50}], x] (* or *) LinearRecurrence[{2, -2, 0, 1}, {1, 2, 2, 0}, 50] (* Harvey P. Dale, May 23 2021 *)
PROG
(PARI) Vec(1 / ((1-x)*(1-x+x^2+x^3)) + O(x^50)) \\ Colin Barker, Jun 20 2017
CROSSREFS
KEYWORD
sign,easy
AUTHOR
N. J. A. Sloane, Nov 17 2002
STATUS
approved