A144556 Number of Sylvester-Gallai geometries on n points.

0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 3, 7, 1, 119, 398, 161925, 24212890

Offset

1,12

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: A309376 A247382 A031436 * A001439 A318215 A086313

Adjacent sequences: A144553 A144554 A144555 * A144557 A144558 A144559

Keyword

nonn,more

Author

N. J. A. Sloane, Jan 01 2009

Status

approved