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

Terms

a(0) =1a(1) =-1a(2) =0a(3) =0a(4) =-1a(5) =2a(6) =-4a(7) =7a(8) =-11a(9) =16a(10) =-21a(11) =26a(12) =-30a(13) =33a(14) =-33a(15) =28a(16) =-14a(17) =-13a(18) =59a(19) =-131a(20) =238a(21) =-390a(22) =598a(23) =-873a(24) =1225a(25) =-1663a(26) =2194a(27) =-2822a(28) =3544a(29) =-4347