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 A231517 #7 Apr 26 2021 14:19:33 %S A231517 2,10,153,7697,1031105,451200772,697702378939,3293112511839389, %T A231517 46764849359077493872,2109508899293218313962632 %N A231517 Number of n X n 0..1 arrays with no element less than a strict majority of its horizontal, diagonal and antidiagonal neighbors. %C A231517 Diagonal of A231523. %e A231517 Some solutions for n=4 %e A231517 ..0..0..0..0....1..0..1..1....0..1..1..1....0..0..0..0....1..0..0..0 %e A231517 ..1..0..0..0....0..0..0..0....1..0..1..1....0..0..0..1....1..0..0..1 %e A231517 ..1..1..0..1....0..0..0..0....0..0..0..1....0..0..0..0....0..0..0..0 %e A231517 ..0..0..1..1....1..1..1..0....0..1..1..0....1..1..1..0....1..1..1..0 %Y A231517 Cf. A231523. %K A231517 nonn %O A231517 1,1 %A A231517 _R. H. Hardin_, Nov 10 2013