A028926 Number of pairs of minimal vectors in n-dimensional lattice Kappa_n.

0, 1, 3, 6, 12, 20, 36, 46, 66, 90, 138, 216, 378, 459, 616, 873, 1645, 2133

Offset

0,3

References

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 161.

Links

Table of n, a(n) for n=0..17.

Crossrefs

A028923 / 2.

Sequence in context: A006128 A247661 A079983 * A038577 A028925 A028924

Adjacent sequences: A028923 A028924 A028925 * A028927 A028928 A028929

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved