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

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =4a(7) =7a(8) =18a(9) =37a(10) =84a(11) =179a(12) =390a(13) =833a(14) =1784a(15) =3791a(16) =8042a(17) =16989a(18) =35804a(19) =75243a(20) =157774a(21) =330105a(22) =689344a(23) =1436935a(24) =2990386a(25) =6213781a(26) =12893604a(27) =26719267a(28) =55302678a(29) =114333617