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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,19
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REFERENCES
| J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 49.
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CROSSREFS
| Cf. A005134, A054907-A054909, A054911.
Sequence in context: A122804 A122544 A205371 * A141826 A178756 A169706
Adjacent sequences: A054905 A054906 A054907 * A054909 A054910 A054911
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KEYWORD
| nonn,nice,hard
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), May 23 2000
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