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Search: id:A054908
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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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+0
3
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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; listen)
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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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CROSSREFS
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Cf. A005134, A054907-A054909, A054911.
Sequence in context: A166552 A122804 A122544 this_sequence A141826 A120340 A082018
Adjacent sequences: A054905 A054906 A054907 this_sequence 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 (njas(AT)research.att.com), May 23 2000
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