Expansion of e.g.f. theta_3^(11/2).

Terms

a(0) =1a(1) =11a(2) =99a(3) =693a(4) =3729a(5) =22275a(6) =259875a(7) =2900205a(8) =19490625a(9) =161008155a(10) =3451399875a(11) =48646261125a(12) =433937559825