Expansion of (theta_3(z)*theta_3(15z)+theta_2(z)*theta_2(15z)).

Terms

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