Expansion of (theta_3(z)*theta_3(3z)*theta_3(9z)+theta_2(z)*theta_2(3z)*theta_2(9z))^2.

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =4a(5) =0a(6) =0a(7) =0a(8) =4a(9) =0a(10) =0a(11) =0a(12) =4a(13) =16a(14) =0a(15) =0a(16) =20a(17) =32a(18) =0a(19) =0a(20) =24a(21) =16a(22) =0a(23) =0a(24) =4a(25) =64a(26) =64a(27) =0a(28) =32a(29) =96