Theta series of quadratic form with Gram matrix [ 2, 1; 1, 12 ].

Terms

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