Expansion of e.g.f. theta_3^(-1/2).

Terms

a(0) =1a(1) =-1a(2) =3a(3) =-15a(4) =81a(5) =-585a(6) =4995a(7) =-46935a(8) =499905a(9) =-6109425a(10) =79791075a(11) =-1138096575a(12) =17774982225a(13) =-294439570425