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A335232
Number of largest subsets of the set of points in an n X n square grid, such that no two points are at the same distance.
4
1, 6, 40, 184, 280, 16, 8, 26800, 4376, 416, 16, 27488, 536, 587640, 10192, 128
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..16.
Ehit Dinesh Agarwal, C program
P. Erdős and R. K. Guy, Distinct distances between lattice points, Elemente der Mathematik 25 (1970), 121-123.
Matt Parker, MPMP: Unique Distancing Problem, Youtube video, May 2020.
Giovanni Resta, The essentially unique 7 x 7 configuration
CROSSREFS
Cf. A193838, A193839.
Size of largest subset in A271490.
Cf. A351699 (generalization to grid rectangles, counting congruent configurations only once).
Sequence in context: A001919 A342404 A005553 * A055344 A210424 A367778
Adjacent sequences: A335229 A335230 A335231 * A335233 A335234 A335235
KEYWORD
nonn,more,hard
AUTHOR
Ehit Dinesh Agarwal, May 27 2020
EXTENSIONS
a(14)-a(16) from Fausto A. C. Cariboni, Jul 03 2022
STATUS
approved

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Last modified October 21 11:02 EDT 2024. Contains 376980 sequences.
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