Expansion of (1-x+x^2)/((x^2+x+1)*(x^2+5*x+1)).

Terms

a(0) =1a(1) =-7a(2) =36a(3) =-173a(4) =827a(5) =-3960a(6) =18973a(7) =-90907a(8) =435564a(9) =-2086913a(10) =9998999a(11) =-47908080a(12) =229541401a(13) =-1099798927a(14) =5269453236a(15) =-25247467253a(16) =120967883027a(17) =-579591947880