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

Terms

a(0) =1a(1) =6a(2) =17a(3) =38a(4) =81a(5) =166a(6) =337a(7) =678a(8) =1361a(9) =2726a(10) =5457a(11) =10918a(12) =21841a(13) =43686a(14) =87377a(15) =174758a(16) =349521a(17) =699046a(18) =1398097a(19) =2796198a(20) =5592401a(21) =11184806a(22) =22369617a(23) =44739238a(24) =89478481a(25) =178956966a(26) =357913937a(27) =715827878a(28) =1431655761a(29) =2863311526