A018815 Number of lines through exactly 8 points of an n X n grid of points.

0, 0, 0, 0, 0, 0, 0, 0, 18, 4, 4, 4, 4, 4, 4, 36, 76, 52, 20, 20, 20, 20, 112, 220, 344, 276, 192, 92, 92, 212, 348, 500, 668, 580, 476, 356, 516, 844, 1204, 1596, 2020, 1804, 1556, 1452, 1332, 1196, 1420, 1660, 1916, 1788, 2256, 2756, 3288, 3852, 4448, 5300, 6200, 6220

Offset

0,9

Links

Seiichi Manyama, Table of n, a(n) for n = 0..1000

S. Mustonen, On lines and their intersection points in a rectangular grid of points

Crossrefs

Sequence in context: A040313 A051522 A134906 * A014974 A008575 A059654

Adjacent sequences: A018812 A018813 A018814 * A018816 A018817 A018818

Keyword

nonn

Author

David W. Wilson

Status

approved