Expansion of ( Sum_{n = -infinity..infinity} x^(n^2) )^(-6).

Terms

a(0) =1a(1) =-12a(2) =84a(3) =-448a(4) =2004a(5) =-7896a(6) =28224a(7) =-93312a(8) =289236a(9) =-848972a(10) =2377704a(11) =-6391872a(12) =16571968a(13) =-41599320a(14) =101430144a(15) =-240877440a(16) =558440916a(17) =-1266406680a(18) =2814053908a(19) =-6136337088a(20) =13148606184a(21) =-27717527552