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A054911 Number of n-dimensional odd unimodular lattice (or quadratic forms). 6
0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 3, 3, 4, 5, 6, 9, 13, 16, 28, 40, 68, 117, 273, 665 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,10

REFERENCES

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 49.

LINKS

Table of n, a(n) for n=0..25.

S. R. Finch, Minkowski-Siegel mass constants

CROSSREFS

Cf. A005134, A054907-A054909.

Sequence in context: A018122 A074732 A089046 * A137267 A123576 A094824

Adjacent sequences:  A054908 A054909 A054910 * A054912 A054913 A054914

KEYWORD

nonn,nice,hard

AUTHOR

N. J. A. Sloane, May 23 2000

STATUS

approved

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Last modified August 14 17:44 EDT 2018. Contains 313751 sequences. (Running on oeis4.)