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A028926 Number of pairs of minimal vectors in n-dimensional lattice Kappa_n. 0
0, 1, 3, 6, 12, 20, 36, 46, 66, 90, 138, 216, 378, 459, 616, 873, 1645, 2133 (list; graph; refs; listen; history; text; internal format)
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

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Last modified November 26 21:07 EST 2021. Contains 349344 sequences. (Running on oeis4.)