A144557 Number of Motzkin-Rabin geometries on n points.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 6, 18, 82, 1000

Offset

1,14

Links

Table of n, a(n) for n=1..18.

L. M. Pretorius and K. J. Swanepoel, The Sylvester-Gallai theorem, colourings and algebra, Discr. Math., 309 (2009), 385-399.

Crossrefs

Sequence in context: A007869 A263915 A360516 * A327729 A273001 A118455

Adjacent sequences: A144554 A144555 A144556 * A144558 A144559 A144560

Keyword

nonn,more

Author

N. J. A. Sloane, Jan 01 2009

Status

approved