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A054907
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Number of n-dimensional unimodular lattice (or quadratic forms) containing no vectors of norm 1.
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4
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1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 3, 1, 4, 3, 12, 12, 28, 49, 180, 368
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,17
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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, A054908-A054909, A054911.
Sequence in context: A035626 A082587 A060043 * A089554 A129246 A125608
Adjacent sequences: A054904 A054905 A054906 * A054908 A054909 A054910
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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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