%I #6 Feb 10 2020 11:08:27
%S 0,0,3,10,31,70,153,268,469,746,1153,1648,2361,3230,4415,5784,7473,
%T 9450,11963,14772,18255,22194,26793,31824,37837,44474,52187,60516,
%U 69983,80318,92233,104972,119525,135294,152739,171240,191685,213510,237915,263640
%N One-half of the number of lines through at least 2 points of an n X n grid of points.
%H M. A. Alekseyev, M. Basova, N. Yu. Zolotykh. <a href="http://dx.doi.org/10.1137/140978090">On the minimal teaching sets of two-dimensional threshold functions</a>. SIAM J. Disc. Math. 29(1), 2015, pp. 157-165.
%Y Equals A018808/2.
%K nonn
%O 0,3
%A _N. J. A. Sloane_, Feb 10 2020
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