A028975 Theta series of quadratic form with Gram matrix [ 3, 1, 0; 1, 3, 1; 0, 1, 3 ].

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, 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, 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

Offset

0,4

Links

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

Example

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 + ...

Crossrefs

Sequence in context: A125214 A114062 A338136 * A145011 A173625 A086036

Adjacent sequences: A028972 A028973 A028974 * A028976 A028977 A028978

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved