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Theta series of quadratic form with Gram matrix [ 3, 1, 0; 1, 3, 1; 0, 1, 3 ].
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%I #11 Jul 17 2014 03:28:16

%S 1,0,0,6,4,2,4,0,4,4,2,8,10,2,0,12,8,0,4,10,6,2,0,4,20,4,6,20,0,4,8,8,

%T 8,8,4,2,24,4,2,16,6,4,2,12,16,10,4,8,22,0,4,40,6,0,10,8,0,4,4,22,36,

%U 2,4,0,20,4,8,16,8,16,2,12,24,4,4,38,22,0,12,8,18,20,4,18,6,4,4

%N Theta series of quadratic form with Gram matrix [ 3, 1, 0; 1, 3, 1; 0, 1, 3 ].

%H John Cannon, <a href="/A028975/b028975.txt">Table of n, a(n) for n = 0..10000</a>

%e 1 + 6*q^3 + 4*q^4 + 2*q^5 + 4*q^6 + 4*q^8 + 4*q^9 + 2*q^10 + 8*q^11 + 10*q^12 + ...

%K nonn

%O 0,4

%A _N. J. A. Sloane_.