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

Terms

a(0) =1a(1) =0a(2) =2a(3) =-3a(4) =6a(5) =-12a(6) =25a(7) =-48a(8) =98a(9) =-195a(10) =390a(11) =-780a(12) =1561a(13) =-3120a(14) =6242a(15) =-12483a(16) =24966a(17) =-49932a(18) =99865a(19) =-199728a(20) =399458a(21) =-798915a(22) =1597830a(23) =-3195660a(24) =6391321a(25) =-12782640a(26) =25565282a(27) =-51130563a(28) =102261126a(29) =-204522252