A331780 One-half of the number of lines through at least 2 points of an n X n grid of points.

0, 0, 3, 10, 31, 70, 153, 268, 469, 746, 1153, 1648, 2361, 3230, 4415, 5784, 7473, 9450, 11963, 14772, 18255, 22194, 26793, 31824, 37837, 44474, 52187, 60516, 69983, 80318, 92233, 104972, 119525, 135294, 152739, 171240, 191685, 213510, 237915, 263640

Offset

0,3

Links

Table of n, a(n) for n=0..39.

M. A. Alekseyev, M. Basova, N. Yu. Zolotykh. On the minimal teaching sets of two-dimensional threshold functions. SIAM J. Disc. Math. 29(1), 2015, pp. 157-165.

Crossrefs

Equals A018808/2.

Sequence in context: A361911 A215287 A316764 * A360563 A290061 A212031

Adjacent sequences: A331777 A331778 A331779 * A331781 A331782 A331783

Keyword

nonn

Author

N. J. A. Sloane, Feb 10 2020

Status

approved