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A028961 Theta series of quadratic form (or lattice) with Gram matrix [ 3, 1; 1, 8 ]. 1

%I

%S 1,0,0,2,0,0,0,0,2,2,0,0,2,2,0,0,2,0,0,0,0,0,0,0,2,0,0,2,0,2,0,2,2,0,

%T 0,0,2,0,0,2,0,2,0,0,0,0,0,2,4,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,4,0,0,0,

%U 0,2,0,2,4,2,0,2,0,0,0,0,0,4,0,0,0,0,0,2,0,0,0,0,0,2,0,0,6,0,0

%N Theta series of quadratic form (or lattice) with Gram matrix [ 3, 1; 1, 8 ].

%C The number of integer solutions (x, y) to 3*x^2 + 2*x*y + 8*y^2, discriminant -92. - _Ray Chandler_, Jul 12 2014

%H John Cannon, <a href="/A028961/b028961.txt">Table of n, a(n) for n = 0..10000</a>

%H N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references)

%K nonn

%O 0,4

%A _N. J. A. Sloane_.

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Last modified September 26 23:42 EDT 2021. Contains 347673 sequences. (Running on oeis4.)