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

Terms

a(0) =1a(1) =-3a(2) =7a(3) =-19a(4) =51a(5) =-135a(6) =359a(7) =-955a(8) =2539a(9) =-6751a(10) =17951a(11) =-47731a(12) =126915a(13) =-337463a(14) =897303a(15) =-2385899a(16) =6344027a(17) =-16868559a(18) =44852943a(19) =-119262499a(20) =317115059a(21) =-843198503a(22) =2242037063a(23) =-5961502747a(24) =15851439563a(25) =-42148455999a(26) =112071357055a(27) =-297994049235a(28) =792356367523