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

Terms

a(0) =1a(1) =-2a(2) =-2a(3) =2a(4) =2a(5) =6a(6) =-2a(7) =2a(8) =-6a(9) =-10a(10) =-2a(11) =-6a(12) =-6a(13) =6a(14) =22a(15) =-6a(16) =26a(17) =14a(18) =22a(19) =-6a(20) =-14a(21) =-2a(22) =-10a(23) =-46a(24) =-46a(25) =-50a(26) =-18a(27) =18a(28) =-78a(29) =22