Expansion of Jacobi theta constant (theta_2/2)^20.

Terms

a(0) =1a(1) =20a(2) =190a(3) =1160a(4) =5225a(5) =18924a(6) =58350a(7) =158840a(8) =391020a(9) =886540a(10) =1877676a(11) =3753640a(12) =7140485a(13) =13014240a(14) =22846170a(15) =38794448a(16) =63969485a(17) =102744780a(18) =161143180a(19) =247386480a(20) =372472353a(21) =550858280a(22) =801535160a(23) =1148976360a(24) =1624208445a(25) =2266848372a(26) =3126467670a(27) =4264095520