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

Terms

a(0) =1a(1) =0a(2) =-9a(3) =10a(4) =45a(5) =-108a(6) =-125a(7) =702a(8) =-135a(9) =-3320a(10) =4239a(11) =11250a(12) =-31931a(13) =-18180a(14) =165915a(15) =-92762a(16) =-651375a(17) =1101168a(18) =1747495a(19) =-6710310a(20) =-694179a(21) =30182500a(22) =-28394829a(23) =-101934450a(24) =229069225a(25) =203510232a(26) =-1198850625a(27) =364506562a(28) =4767453045