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Search: id:A005134
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| A005134 |
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Number of n-dimensional unimodular lattice (or quadratic forms).
(Formerly M0219)
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+0
5
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| 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 4, 5, 8, 9, 13, 16, 28, 40, 68, 117, 297, 665
(list; graph; listen)
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OFFSET
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0,9
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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.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
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Cf. A054907-A054909, A054911.
Sequence in context: A029083 A153683 A005139 this_sequence A081651 A029193 A005858
Adjacent sequences: A005131 A005132 A005133 this_sequence A005135 A005136 A005137
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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).
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