G.f. Sum_{n=-oo..+oo} x^n * (1 + x^n)^(n^3).

Terms

a(0) =2a(1) =0a(2) =3a(3) =0a(4) =10a(5) =0a(6) =57a(7) =0a(8) =122a(9) =351a(10) =197a(11) =0a(12) =5215a(13) =0a(14) =374a(15) =25300a(16) =42178a(17) =0a(18) =104718a(19) =0a(20) =954008a(21) =354663a(22) =1663a(23) =0a(24) =10300656a(25) =9691375a(26) =3915a(27) =2485431a(28) =81640573a(29) =0