Expansion of x^2*(1 + 2*x - x^2)/(1 - x - 3*x^2 - x^3 + x^4).

Terms

a(0) =0a(1) =1a(2) =3a(3) =5a(4) =15a(5) =32a(6) =79a(7) =185a(8) =439a(9) =1041a(10) =2464a(11) =5841a(12) =13835a(13) =32781a(14) =77663a(15) =184000a(16) =435935a(17) =1032817a(18) =2446959a(19) =5797345a(20) =13735104a(21) =32541281a(22) =77096979a(23) =182658581a(24) =432755695a(25) =1025287136a(26) =2429115823a(27) =5755074345a(28) =13634953255a(29) =32304004977