OFFSET
1,2
REFERENCES
J. Martinet, Les reseaux parfaits des espaces Euclidiens, Masson, Paris, 1996.
J. Martinet, Perfect Lattices in Euclidean Spaces, Springer-Verlag, NY, 2003.
G. Nebe, Review of J. Martinet, Perfect Lattices in Euclidean Spaces, Bull. Amer. Math. Soc., 41 (No. 4, 2004), 529-533.
LINKS
Christian Batut and Jacques Martinet, Lattices and spherical designs, 2005-2014. See pages 12-13.
J. Martinet and B. Venkov, Les réseaux fortement eutactiques, pp. 112-132 in Réseaux Euclidiens, Designs Sphériques et Formes Modulaires, ed. J. Martinet, L'Enseignement Mathématique, Geneva, 2001.
CROSSREFS
KEYWORD
nonn,nice,hard,more
AUTHOR
N. J. A. Sloane, Nov 16 2001
EXTENSIONS
It is known that a(6) >= 19, a(7) >= 10.
a(5) corrected and a(6) added from Batut & Martinet by Andrey Zabolotskiy, Feb 20 2021
STATUS
approved