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A190477
Constant arising in lattice coverings of Nil space by congruent geodesic balls.
0
1, 4, 2, 9, 0, 0, 6, 1, 5
OFFSET
1,2
COMMENTS
The Nil geometry is one of the eight 3-dimensional Thurston geometries, which can be derived from W. Heisenberg's real matrix group.
EXAMPLE
Approximately 1.42900615.
CROSSREFS
Sequence in context: A084477 A046589 A072562 * A143311 A016696 A127470
KEYWORD
nonn,cons
AUTHOR
Jonathan Vos Post, May 10 2011
STATUS
approved