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

Terms

a(0) =1a(1) =-3a(2) =2a(3) =-5a(4) =17a(5) =-23a(6) =43a(7) =-87a(8) =178a(9) =-378a(10) =700a(11) =-1402a(12) =2837a(13) =-5651a(14) =11295a(15) =-22592a(16) =45397a(17) =-90587a(18) =181187a(19) =-362566a(20) =724949a(21) =-1449986a(22) =2900068a(23) =-5801059a(24) =11601675a(25) =-23204798a(26) =46409816a(27) =-92817126a(28) =185633688a(29) =-371270603