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

Terms

a(0) =0a(1) =1a(2) =4a(3) =19a(4) =88a(5) =409a(6) =1900a(7) =8827a(8) =41008a(9) =190513a(10) =885076a(11) =4111843a(12) =19102600a(13) =88745929a(14) =412291516a(15) =1915403851a(16) =8898489952a(17) =41340171361a(18) =192056155300a(19) =892245135283