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 A231750 #6 Jul 23 2025 06:40:00 %S A231750 51,687,41288,1787168,67411714,2966010838,131956285636,5669387332934, %T A231750 243573416110820,10555475178328001,457172040211929179, %U A231750 19760692150060588600,854390327504135396722,36958540950287007144750 %N A231750 Number of nX5 0..2 arrays with no element less than a strict majority of its horizontal, vertical, diagonal and antidiagonal neighbors. %C A231750 Column 5 of A231753 %H A231750 R. H. Hardin, <a href="/A231750/b231750.txt">Table of n, a(n) for n = 1..210</a> %e A231750 Some solutions for n=3 %e A231750 ..2..1..2..0..0....1..0..0..0..1....1..0..2..1..1....1..1..1..0..0 %e A231750 ..1..0..0..0..1....0..0..2..0..0....0..0..0..0..2....0..0..0..1..0 %e A231750 ..0..0..0..0..0....0..2..2..2..0....0..0..0..0..0....0..0..1..0..0 %K A231750 nonn %O A231750 1,1 %A A231750 _R. H. Hardin_, Nov 13 2013