Theta series of quadratic form with Gram matrix [ 7, 1, -3; 1, 3, 1; -3, 1, 7 ].

Terms

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