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

Terms

a(0) =1a(1) =-3a(2) =1a(3) =-4a(4) =4a(5) =-5a(6) =8a(7) =-9a(8) =13a(9) =-17a(10) =22a(11) =-30a(12) =39a(13) =-52a(14) =69a(15) =-91a(16) =121a(17) =-160a(18) =212a(19) =-281a(20) =372a(21) =-493a(22) =653a(23) =-865a(24) =1146a(25) =-1518a(26) =2011a(27) =-2664a(28) =3529a(29) =-4675