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 A231757 #7 Jul 23 2025 06:40:28 %S A231757 9,136,5041,493695,175642009,216545491864,682267982467600, %T A231757 6184663140527966655,184835030323441507989529, %U A231757 17039092957711747812559207879,4549223325244087259619117440725081 %N A231757 Number of (n+1)X(n+1) 0..1 arrays with no element having a strict majority of its horizontal, diagonal and antidiagonal neighbors equal to one. %C A231757 Diagonal of A231764 %H A231757 R. H. Hardin, <a href="/A231757/b231757.txt">Table of n, a(n) for n = 1..13</a> %e A231757 Some solutions for n=3 %e A231757 ..1..1..1..0....0..0..0..1....0..0..0..0....0..1..1..0....0..1..1..0 %e A231757 ..0..0..0..1....0..0..0..1....0..1..1..1....1..0..0..0....0..0..0..0 %e A231757 ..1..0..0..1....0..1..1..0....0..0..0..1....1..0..0..1....0..0..0..0 %e A231757 ..1..0..0..1....1..0..0..1....0..0..0..0....1..0..0..0....0..0..0..1 %K A231757 nonn %O A231757 1,1 %A A231757 _R. H. Hardin_, Nov 13 2013