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

Terms

a(0) =1a(1) =5a(2) =14a(3) =37a(4) =97a(5) =254a(6) =665a(7) =1741a(8) =4558a(9) =11933a(10) =31241a(11) =81790a(12) =214129a(13) =560597a(14) =1467662a(15) =3842389a(16) =10059505a(17) =26336126a(18) =68948873a(19) =180510493a(20) =472582606a(21) =1237237325a(22) =3239129369a(23) =8480150782a(24) =22201322977a(25) =58123818149a(26) =152170131470a(27) =398386576261