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A028961 Theta series of quadratic form (or lattice) with Gram matrix [ 3, 1; 1, 8 ]. 1
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, 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, 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

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

LINKS

John Cannon, Table of n, a(n) for n = 0..10000

N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)

CROSSREFS

Sequence in context: A073091 A125250 A048113 * A110177 A036273 A174469

Adjacent sequences:  A028958 A028959 A028960 * A028962 A028963 A028964

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 20 05:07 EST 2019. Contains 329323 sequences. (Running on oeis4.)