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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 (list; constant; graph; refs; listen; history; text; internal format)
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.

LINKS

Table of n, a(n) for n=1..9.

Jeno Szirmai, On lattice coverings of Nil space by congruent geodesic balls, May 10, 2011.

EXAMPLE

Approximately 1.42900615.

CROSSREFS

Sequence in context: A084477 A046589 A072562 * A143311 A016696 A127470

Adjacent sequences:  A190474 A190475 A190476 * A190478 A190479 A190480

KEYWORD

nonn,cons

AUTHOR

Jonathan Vos Post, May 10 2011

STATUS

approved

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Last modified May 25 11:27 EDT 2020. Contains 334592 sequences. (Running on oeis4.)