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

Terms

a(0) =1a(1) =-2a(2) =0a(3) =-6a(4) =16a(5) =-18a(6) =48a(7) =-94a(8) =208a(9) =-426a(10) =752a(11) =-1646a(12) =3360a(13) =-6578a(14) =13056a(15) =-26358a(16) =53456a(17) =-105890a(18) =211392a(19) =-424366a(20) =850544a(21) =-1699290a(22) =3393136a(23) =-6795646a(24) =13601184a(25) =-27188130a(26) =54358000a(27) =-108752870a(28) =217552976a(29) =-435033618