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A018816 Number of lines through exactly 9 points of an n X n grid of points. 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified February 25 08:33 EST 2021. Contains 341606 sequences. (Running on oeis4.)