|
| |
|
|
A054908
|
|
Number of n-dimensional odd unimodular lattice (or quadratic forms) containing no vectors of norm 1.
|
|
2
|
|
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 4, 3, 12, 12, 28, 49, 156, 368
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,19
|
|
|
REFERENCES
|
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 49.
|
|
|
LINKS
|
Table of n, a(n) for n=0..25.
|
|
|
CROSSREFS
|
Cf. A005134, A054907-A054909, A054911.
Sequence in context: A122544 A205371 A215942 * A141826 A178756 A169706
Adjacent sequences: A054905 A054906 A054907 * A054909 A054910 A054911
|
|
|
KEYWORD
|
nonn,nice,hard
|
|
|
AUTHOR
|
N. J. A. Sloane, May 23 2000
|
|
|
STATUS
|
approved
|
| |
|
|
