G.f.: A(x) = Sum_{n=-oo..+oo} (x - x^n)^n.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-2a(4) =3a(5) =-3a(6) =1a(7) =1a(8) =1a(9) =-7a(10) =10a(11) =-6a(12) =1a(13) =0a(14) =1a(15) =-8a(16) =23a(17) =-25a(18) =1a(19) =17a(20) =1a(21) =-32a(22) =36a(23) =-12a(24) =1a(25) =-21a(26) =26a(27) =-14a(28) =55a(29) =-92