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

Terms

a(0) =0a(1) =4a(2) =16a(3) =80a(4) =384a(5) =1856a(6) =8960a(7) =43264a(8) =208896a(9) =1008640a(10) =4870144a(11) =23515136a(12) =113541120a(13) =548225024a(14) =2647064576a(15) =12781158400a(16) =61712891904a(17) =297976201216