A028971 Theta series of quadratic form with Gram matrix [ 3, 1, 1; 1, 3, 1; 1, 1, 3 ].

1, 0, 0, 6, 6, 0, 0, 6, 6, 0, 0, 12, 12, 0, 0, 2, 18, 0, 0, 24, 0, 0, 0, 6, 12, 0, 0, 24, 24, 0, 0, 12, 18, 0, 0, 6, 18, 0, 0, 12, 6, 0, 0, 42, 24, 0, 0, 6, 24, 0, 0, 36, 24, 0, 0, 0, 12, 0, 0, 24, 8, 0, 0, 18, 42, 0, 0, 54, 12, 0, 0, 12, 30, 0, 0, 6, 48, 0, 0, 24, 0, 0, 0, 30, 24, 0