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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
| 0,2
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COMMENTS
| The g.f. (1+z+2*z**2+2*z**3+6*z**4)/(1-2*z+2*z**3) conjectured by S. Plouffe in his 1992 dissertation is almost certainly wrong.
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REFERENCES
| 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
| S. Plouffe, Approximations de S\'{e}ries G\'{e}n\'{e}ratrices et Quelques Conjectures, Dissertation, Universit\'{e} du Qu\'{e}bec \`{a} Montr\'{e}al, 1992.
S. Plouffe, 1031 Generating Functions and Conjectures, Universit\'{e} du Qu\'{e}bec \`{a} Montr\'{e}al, 1992.
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CROSSREFS
| Sequence in context: A068039 A188123 A081661 * A001978 A173283 A077552
Adjacent sequences: A005100 A005101 A005102 * A005104 A005105 A005106
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KEYWORD
| nonn,hard
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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