Theta series of quadratic form (or lattice) with Gram matrix [ 3, 1; 1, 5 ].

Terms

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