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

Terms

a(0) =1a(1) =-1a(2) =2a(3) =-3a(4) =9a(5) =-13a(6) =31a(7) =-53a(8) =118a(9) =-210a(10) =452a(11) =-866a(12) =1793a(13) =-3493a(14) =7119a(15) =-13992a(16) =28257a(17) =-56253a(18) =113035a(19) =-225318a(20) =451745a(21) =-901870a(22) =1805976a(23) =-3609701a(24) =7222075a(25) =-14439594a(26) =28887060a(27) =-57763494a(28) =115540784a(29) =-231066845