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

Terms

a(0) =1a(1) =1a(2) =-1a(3) =-2a(4) =1a(5) =3a(6) =-2a(7) =-5a(8) =5a(9) =10a(10) =-11a(11) =-21a(12) =22a(13) =43a(14) =-43a(15) =-86a(16) =85a(17) =171a(18) =-170a(19) =-341a(20) =341a(21) =682a(22) =-683a(23) =-1365a(24) =1366a(25) =2731a(26) =-2731a(27) =-5462a(28) =5461a(29) =10923