Theta series of quadratic form with Gram matrix [ 1, 0, 0; 0, 2, 1; 0, 1, 2 ].

Terms

a(0) =1a(1) =2a(2) =6a(3) =12a(4) =2a(5) =0a(6) =18a(7) =12a(8) =6a(9) =14a(10) =12a(11) =12a(12) =12a(13) =0a(14) =12a(15) =36a(16) =2a(17) =12a(18) =42a(19) =12a(20) =0a(21) =0a(22) =24a(23) =24a(24) =18a(25) =14a(26) =12a(27) =48a(28) =12a(29) =0