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A005103
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Minimal determinant of n-dimensional norm 3 lattice.
(Formerly M2724)
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0
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OFFSET
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0,2
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COMMENTS
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The g.f. (1 + z + 2*z^2 + 2*z^3 + 6*z^4)/(1 - 2*z + 2*z*^3) conjectured by Simon Plouffe in his 1992 dissertation is almost certainly wrong.
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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. 180.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more,hard
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AUTHOR
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STATUS
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approved
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