Expansion of (1+3*x)/(1-5*x).

Terms

a(0) =1a(1) =8a(2) =40a(3) =200a(4) =1000a(5) =5000a(6) =25000a(7) =125000a(8) =625000a(9) =3125000a(10) =15625000a(11) =78125000a(12) =390625000a(13) =1953125000a(14) =9765625000a(15) =48828125000a(16) =244140625000