This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A296468 #34 Jan 07 2020 11:34:59
%S A296468 1,4,6,11,17,24,28,32,40,47,57,66,78,90
%N A296468 Largest number of points that can be placed on an n X n point grid so that no point is equally distant from two other points on the same row or column.
%C A296468 This sequence is a 2-dimensional generalization of A003002 ("no 3-term arithmetic progressions").
%e A296468 Up to 66 points (x) may be placed on a 12 X 12 point grid. Example with two symmetry axes:
%e A296468 x x . x x . . . . x x .
%e A296468 x . x . . x x . . x . x
%e A296468 . x x . . . . x x . x x
%e A296468 x . . . . x x . x x . .
%e A296468 x . . . x . x x . x . .
%e A296468 . x . x . . . x x . x .
%e A296468 . x . x x . . . x . x .
%e A296468 . . x . x x . x . . . x
%e A296468 . . x x . x x . . . . x
%e A296468 x x . x x . . . . x x .
%e A296468 x . x . . x x . . x . x
%e A296468 . x x . . . . x x . x x
%Y A296468 Cf. A003002, A193838, A300131.
%K A296468 nonn,hard,more,nice
%O A296468 1,2
%A A296468 _Heinrich Ludwig_, Dec 13 2017
%E A296468 a(13)-a(14) from _Bert Dobbelaere_, Jan 06 2020