A018816 Number of lines through exactly 9 points of an n X n grid of points.

0, 0, 0, 0, 0, 0, 0, 0, 0, 20, 4, 4, 4, 4, 4, 4, 4, 40, 84, 56, 20, 20, 20, 20, 20, 124, 244, 380, 300, 204, 92, 92, 92, 228, 380, 548, 732, 628, 508, 372, 220, 556, 924, 1324, 1756, 2220, 1964, 1676, 1356, 1204, 1036, 1268, 1516, 1780, 2060, 1908, 1740, 2252, 2796, 3372

Offset

0,10

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: A327701 A337157 A040388 * A040389 A040386 A309321

Adjacent sequences: A018813 A018814 A018815 * A018817 A018818 A018819

Keyword

nonn

Author

David W. Wilson

Status

approved