A144556 - OEIS

%I #6 Jan 13 2020 11:01:16

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

%N Number of Sylvester-Gallai geometries on n points.

%H L. M. Pretorius and K. J. Swanepoel, <a href="https://doi.org/10.1016/j.disc.2007.12.027">The Sylvester-Gallai theorem, colourings and algebra</a>, Discr. Math., 309 (2009), 385-399.

%K nonn,more

%O 1,12

%A _N. J. A. Sloane_, Jan 01 2009