Expansion of (1-5x)/(1-8x+4x^2).

Terms

a(0) =1a(1) =3a(2) =20a(3) =148a(4) =1104a(5) =8240a(6) =61504a(7) =459072a(8) =3426560a(9) =25576192a(10) =190903296a(11) =1424921600a(12) =10635759616a(13) =79386390528a(14) =592548085760