Expansion of (1-3x)/(1-6x+8x^2+x^3).

Terms

a(0) =1a(1) =3a(2) =10a(3) =35a(4) =127a(5) =472a(6) =1781a(7) =6783a(8) =25978a(9) =99823a(10) =384331a(11) =1481424a(12) =5714073a(13) =22048715a(14) =85098282a(15) =328485899a(16) =1268080423a(17) =4895497064a(18) =18899853101a(19) =72967061671a(20) =281708048154