|
Search: id:A054907
|
|
|
| A054907 |
|
Number of n-dimensional unimodular lattice (or quadratic forms) containing no vectors of norm 1. |
|
+0
5
|
|
| 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 3, 1, 4, 3, 12, 12, 28, 49, 180, 368
(list; graph; listen)
|
|
|
OFFSET
|
0,17
|
|
|
REFERENCES
|
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 49.
|
|
CROSSREFS
|
Cf. A005134, A054908-A054909, A054911.
Sequence in context: A035626 A082587 A060043 this_sequence A089554 A129246 A125608
Adjacent sequences: A054904 A054905 A054906 this_sequence A054908 A054909 A054910
|
|
KEYWORD
|
nonn,nice,hard
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com), May 23 2000
|
|
|
Search completed in 0.002 seconds
|
