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A005138 Number of n-dimensional determinant 2 lattices.
(Formerly M0262)
0
0, 1, 1, 1, 1, 1, 1, 2, 2, 3, 3, 4, 4, 6, 7, 11, 14, 24, 30 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,8

REFERENCES

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 400.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=0..18.

CROSSREFS

Sequence in context: A173091 A029025 A035396 * A035679 A136537 A153928

Adjacent sequences:  A005135 A005136 A005137 * A005139 A005140 A005141

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 15 19:54 EST 2018. Contains 317240 sequences. (Running on oeis4.)