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

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =4a(5) =7a(6) =16a(7) =19a(8) =37a(9) =67a(10) =94a(11) =178a(12) =295a(13) =460a(14) =829a(15) =1345a(16) =2209a(17) =3832a(18) =6244a(19) =10459a(20) =17740a(21) =29191a(22) =49117a(23) =82411a(24) =136690a(25) =229762a(26) =383923a(27) =639832a(28) =1073209a(29) =1791601