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A054907
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Number of n-dimensional unimodular lattices (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, 1901, 14493, 357003
(list;
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listen;
history;
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internal format)
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OFFSET
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0,17
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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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Gaëtan Chenevier, Unimodular hunting, Modular Forms Workshop, Oberwolfach online, Feb 2021.
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FORMULA
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CROSSREFS
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KEYWORD
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nonn,nice,hard
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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