Expansion of Product_{k>=1} ((1 - 4*x^k)/(1 + 4*x^k))^(1/4).

Terms

a(0) =1a(1) =-2a(2) =0a(3) =-10a(4) =22a(5) =-102a(6) =244a(7) =-1270a(8) =3360a(9) =-16886a(10) =46160a(11) =-230670a(12) =656550a(13) =-3238250a(14) =9474684a(15) =-46289530a(16) =138590342a(17) =-671116710a(18) =2047182480a(19) =-9837322110a(20) =30482926482a(21) =-145474988978a(22) =456854466860