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A018814 Number of lines through exactly 7 points of an n X n grid of points. 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 20 18:35 EDT 2019. Contains 327245 sequences. (Running on oeis4.)