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

Terms

a(0) =1a(1) =-2a(2) =3a(3) =-2a(4) =0a(5) =3a(6) =-5a(7) =5a(8) =-2a(9) =-3a(10) =8a(11) =-10a(12) =7a(13) =1a(14) =-11a(15) =18a(16) =-17a(17) =6a(18) =12a(19) =-29a(20) =35a(21) =-23a(22) =-6a(23) =41a(24) =-64a(25) =58a(26) =-17a(27) =-47a(28) =105a(29) =-122