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

Terms

a(0) =0a(1) =1a(2) =4a(3) =48a(4) =320a(5) =2816a(6) =21504a(7) =176128a(8) =1392640a(9) =11206656a(10) =89391104a(11) =716177408a(12) =5725224960a(13) =45818576896a(14) =366481506304