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A054908
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Number of n-dimensional odd unimodular lattice (or quadratic forms) containing no vectors of norm 1.
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2
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 4, 3, 12, 12, 28, 49, 156, 368
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listen;
history;
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OFFSET
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0,19
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REFERENCES
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J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 49.
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LINKS
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Table of n, a(n) for n=0..25.
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CROSSREFS
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Cf. A005134, A054907-A054909, A054911.
Sequence in context: A122544 A205371 A215942 * A141826 A178756 A169706
Adjacent sequences: A054905 A054906 A054907 * A054909 A054910 A054911
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KEYWORD
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nonn,nice,hard
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AUTHOR
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N. J. A. Sloane, May 23 2000
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STATUS
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approved
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