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

Terms

a(0) =1a(1) =-4a(2) =17a(3) =-80a(4) =384a(5) =-1842a(6) =8827a(7) =-42292a(8) =202631a(9) =-970862a(10) =4651680a(11) =-22287540a(12) =106786021a(13) =-511642564a(14) =2451426797a(15) =-11745491420a(16) =56276030304a(17) =-269634660102