Expansion of (theta_3(z)*theta_3(19z) + theta_2(z)*theta_2(19z))^2.

Terms

a(0) =1a(1) =4a(2) =4a(3) =0a(4) =4a(5) =16a(6) =16a(7) =8a(8) =20a(9) =20a(10) =24a(11) =24a(12) =48a(13) =8a(14) =32a(15) =16a(16) =52a(17) =16a(18) =52a(19) =4a(20) =40a(21) =48a(22) =48a(23) =32a(24) =80a(25) =52a(26) =56a(27) =64a(28) =80a(29) =56