Expansion of Product_{k>=1} ((1 - 2*x^k)/(1 + 2*x^k))^(1/2).

Terms

a(0) =1a(1) =-2a(2) =0a(3) =-2a(4) =6a(5) =-6a(6) =12a(7) =-22a(8) =48a(9) =-94a(10) =160a(11) =-318a(12) =622a(13) =-1210a(14) =2268a(15) =-4482a(16) =8678a(17) =-16998a(18) =32632a(19) =-64366a(20) =124674a(21) =-245866a(22) =476108a(23) =-940866a(24) =1829148a(25) =-3617066a(26) =7040112a(27) =-13937530a(28) =27186810a(29) =-53857062