Theta series of quadratic form (or lattice) with Gram matrix [ 4, 1; 1, 6 ].

Terms

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