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

Terms

a(0) =0a(1) =1a(2) =4a(3) =9a(4) =20a(5) =41a(6) =84a(7) =169a(8) =340a(9) =681a(10) =1364a(11) =2729a(12) =5460a(13) =10921a(14) =21844a(15) =43689a(16) =87380a(17) =174761a(18) =349524a(19) =699049a(20) =1398100a(21) =2796201a(22) =5592404a(23) =11184809a(24) =22369620a(25) =44739241a(26) =89478484a(27) =178956969a(28) =357913940a(29) =715827881