A005140 Number of n-dimensional determinant 4 lattices. (Formerly M0499)

0, 1, 1, 2, 3, 4, 5, 6, 7, 10, 13, 16, 22

Offset

0,4

References

J. H. Conway and N. J. A. Sloane, Low-dimensional lattices I: quadratic forms of small determinant, Proc. Royal Soc. London, A 418 (1988), 17-41.

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..12.

Crossrefs

Sequence in context: A112881 A308019 A008814 * A176486 A017845 A211698

Adjacent sequences: A005137 A005138 A005139 * A005141 A005142 A005143

Keyword

nonn

Author

N. J. A. Sloane

Status

approved