Expansion of (theta_3(z)*theta_3(7z)+theta_2(z)*theta_2(7z))^3.

Terms

a(0) =1a(1) =6a(2) =24a(3) =56a(4) =114a(5) =168a(6) =280a(7) =294a(8) =444a(9) =390a(10) =840a(11) =636a(12) =1176a(13) =1176a(14) =1512a(15) =1008a(16) =1782a(17) =2016a(18) =1896a(19) =2520a(20) =3528a(21) =2408a(22) =3216a(23) =2796a(24) =4760a(25) =3174a(26) =5880a(27) =4592a(28) =6258a(29) =4380