OFFSET
0,3
FORMULA
MATHEMATICA
CoefficientList[Series[x (1 + x^2)/(1 - x + x^2)^3, {x, 0, 45}], x] (* Michael De Vlieger, Feb 18 2017 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Wolfdieter Lang, Feb 18 2017
STATUS
approved