Theta series of quadratic form (or lattice) with Gram matrix [ 1, 0, 0; 0, 2, 1; 0, 1, 3 ].

Terms

a(0) =1a(1) =2a(2) =2a(3) =8a(4) =10a(5) =0a(6) =4a(7) =12a(8) =10a(9) =6a(10) =2a(11) =16a(12) =16a(13) =8a(14) =4a(15) =4a(16) =26a(17) =4a(18) =10a(19) =32a(20) =0a(21) =8a(22) =12a(23) =12a(24) =20a(25) =2a(26) =4a(27) =32a(28) =36a(29) =8