Expansion of (1-2x)/(1-x^2+x^3).

Terms

a(0) =1a(1) =-2a(2) =1a(3) =-3a(4) =3a(5) =-4a(6) =6a(7) =-7a(8) =10a(9) =-13a(10) =17a(11) =-23a(12) =30a(13) =-40a(14) =53a(15) =-70a(16) =93a(17) =-123a(18) =163a(19) =-216a(20) =286a(21) =-379a(22) =502a(23) =-665a(24) =881a(25) =-1167a(26) =1546a(27) =-2048a(28) =2713a(29) =-3594