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

Terms

a(0) =1a(1) =-1a(2) =-2a(3) =-1a(4) =1a(5) =3a(6) =4a(7) =3a(8) =1a(9) =-2a(10) =-6a(11) =-8a(12) =-8a(13) =-8a(14) =-5a(15) =2a(16) =8a(17) =12a(18) =17a(19) =22a(20) =23a(21) =17a(22) =7a(23) =0a(24) =-7a(25) =-22a(26) =-40a(27) =-51a(28) =-53a(29) =-49