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

Terms

a(0) =1a(1) =-1a(2) =1a(3) =1a(4) =-1a(5) =3a(6) =1a(7) =1a(8) =7a(9) =3a(10) =9a(11) =17a(12) =15a(13) =35a(14) =49a(15) =65a(16) =119a(17) =163a(18) =249a(19) =401a(20) =575a(21) =899a(22) =1377a(23) =2049a(24) =3175a(25) =4803a(26) =7273a(27) =11153a(28) =16879a(29) =25699