G.f.: Sum_{n>=1} (-1)^(n-1) * x^(n^2)/(1 - x^n)^n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =0a(4) =1a(5) =-1a(6) =1a(7) =-2a(8) =2a(9) =-3a(10) =1a(11) =-1a(12) =1a(13) =-5a(14) =7a(15) =-7a(16) =1a(17) =3a(18) =1a(19) =-12a(20) =16a(21) =-9a(22) =1a(23) =1a(24) =2a(25) =-11a(26) =29a(27) =-32a(28) =1a(29) =28