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

Terms

a(0) =1a(1) =2a(2) =10a(3) =40a(4) =172a(5) =728a(6) =3096a(7) =13152a(8) =55888a(9) =237472a(10) =1009056a(11) =4287616a(12) =18218688a(13) =77413760a(14) =328941952a(15) =1397720576a(16) =5939111168a(17) =25236118016a(18) =107231812096a(19) =455643039744