%I #12 Dec 02 2018 04:08:25

%S 0,0,0,0,3,4,11,40,41,132,122,524,407,1284,3681,5683,6800,18853

%N Number of ways of placing 2n points on n X n grid so no 3 are in a line (solutions with no symmetry).

%H Benjamin Chaffin, <a href="http://wso.williams.edu/~bchaffin/no_three_in_line/index.htm">No-Three-In-Line Problem</a>.

%H A. Flammenkamp, <a href="http://wwwhomes.uni-bielefeld.de/achim/no3in/table_old.txt">Solutions of the no-three-in-line problem</a>

%H A. Flammenkamp, <a href="http://wwwhomes.uni-bielefeld.de/achim/no3in/table.txt">Solutions of the no-three-in-line problem</a>

%H A. Flammenkamp, <a href="https://doi.org/10.1016/0097-3165(92)90012-J">Progress in the no-three-in-line problem</a>, J. Combinat. Theory A 60 (1992), 305-311.

%H A. Flammenkamp, <a href="https://doi.org/10.1006/jcta.1997.2829">Progress in the no-three-in-line problem. II</a>, J. Combin. Theory Ser. A 81 (1998), no. 1, 108-113.

%Y Cf. A000769, A000755.

%K nonn,more

%O 1,5

%A _N. J. A. Sloane_.

%E a(17) and a(18) from _Benjamin Chaffin_, Apr 05 2006