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

Terms

a(0) =0a(1) =1a(2) =1a(3) =4a(4) =6a(5) =13a(6) =21a(7) =40a(8) =66a(9) =121a(10) =201a(11) =364a(12) =606a(13) =1093a(14) =1821a(15) =3280a(16) =5466a(17) =9841a(18) =16401a(19) =29524a(20) =49206a(21) =88573a(22) =147621a(23) =265720a(24) =442866a(25) =797161a(26) =1328601a(27) =2391484a(28) =3985806a(29) =7174453