Expansion of ( Sum_{n = -infinity..infinity} x^(n^2) )^(-7).

Terms

a(0) =1a(1) =-14a(2) =112a(3) =-672a(4) =3346a(5) =-14560a(6) =57120a(7) =-206208a(8) =694960a(9) =-2209774a(10) =6683040a(11) =-19345760a(12) =53874912a(13) =-144936288a(14) =377965760a(15) =-958231680a(16) =2367566866a(17) =-5713057728a(18) =13488657168a(19) =-31210552800a(20) =70873262880a(21) =-158145658560