Expansion of g.f. A(x) satisfying 1 = Sum_{n=-oo..+oo} x^(n*(n-1)/2) * (x^n - A(x))^n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =3a(6) =8a(7) =12a(8) =29a(9) =48a(10) =105a(11) =202a(12) =420a(13) =831a(14) =1729a(15) =3538a(16) =7370a(17) =15293a(18) =32094a(19) =67410a(20) =142221a(21) =301074a(22) =639076a(23) =1360991a(24) =2903607a(25) =6213695a(26) =13318015a(27) =28616357a(28) =61576994a(29) =132779990