A018814 Number of lines through exactly 7 points of an n X n grid of points.

0, 0, 0, 0, 0, 0, 0, 16, 4, 4, 4, 4, 4, 32, 68, 48, 20, 20, 20, 100, 196, 308, 252, 180, 92, 196, 316, 452, 604, 532, 444, 596, 764, 1084, 1436, 1820, 1644, 1588, 1516, 1428, 1324, 1540, 1772, 2196, 2652, 3140, 3660, 4212, 4796, 6012, 6084, 6140, 6180, 6204, 6212

Offset

0,8

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: A075462 A082959 A232014 * A307407 A234288 A177499

Adjacent sequences: A018811 A018812 A018813 * A018815 A018816 A018817

Keyword

nonn

Author

David W. Wilson

Status

approved