Expansion of (theta_3(z)*theta_3(13z)+theta_2(z)*theta_2(13z))^2.

Terms

a(0) =1a(1) =0a(2) =4a(3) =0a(4) =4a(5) =0a(6) =0a(7) =8a(8) =4a(9) =16a(10) =8a(11) =8a(12) =0a(13) =16a(14) =16a(15) =16a(16) =4a(17) =0a(18) =36a(19) =24a(20) =8a(21) =16a(22) =16a(23) =0a(24) =0a(25) =16a(26) =44a(27) =16a(28) =16a(29) =16