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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 December 1 17:57 EST 2024. Contains 378302 sequences.
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