Expansion of e.g.f. theta_3^(9/2).

Terms

a(0) =1a(1) =9a(2) =63a(3) =315a(4) =1161a(5) =8505a(6) =112455a(7) =796635a(8) =2843505a(9) =57661065a(10) =1099313775a(11) =9327901275a(12) =92211082425