OFFSET
1,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
FORMULA
G.f.: x*(2x^3-x^2+1)/((1-x)*(1-2x^2-x^3+x^4)).
MATHEMATICA
CoefficientList[Series[(2 x^3 - x^2 + 1) / ((1 - x) (1 - 2 x^2 - x^3 + x^4)), {x, 0, 40}], x] (* Vincenzo Librandi, Aug 03 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved