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

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =4a(7) =0a(8) =8a(9) =-3a(10) =16a(11) =-12a(12) =36a(13) =-40a(14) =88a(15) =-117a(16) =220a(17) =-321a(18) =560a(19) =-860a(20) =1447a(21) =-2284a(22) =3772a(23) =-6032a(24) =9861a(25) =-15864a(26) =25798a(27) =-41627a(28) =67527a(29) =-109132