A028925 Maximal number of pairs of minimal vectors in an n-dimensional lattice.

0, 1, 3, 6, 12, 20, 36, 63, 120, 136

Offset

0,3

References

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 15.

Links

Table of n, a(n) for n=0..9.

Crossrefs

A001116 / 2.

Sequence in context: A079983 A028926 A038577 * A028924 A034738 A054064

Adjacent sequences: A028922 A028923 A028924 * A028926 A028927 A028928

Keyword

nonn,hard,more

Author

N. J. A. Sloane.

Status

approved