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

Terms

a(0) =1a(1) =-2a(2) =2a(3) =-6a(4) =14a(5) =-26a(6) =50a(7) =-102a(8) =214a(9) =-426a(10) =834a(11) =-1678a(12) =3398a(13) =-6778a(14) =13482a(15) =-27022a(16) =54198a(17) =-108306a(18) =216346a(19) =-432878a(20) =866334a(21) =-1732386a(22) =3463626a(23) =-6927926a(24) =13858350a(25) =-27715378a(26) =55426002a(27) =-110855030a(28) =221719582a(29) =-443433610