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 A231527 #6 Jul 23 2025 06:34:07 %S A231527 32,113,3861,66499,1031105,17572772,322599407,5763804982,100713173563, %T A231527 1765702022971,31188391464064,550845806313494,9708135650398539, %U A231527 171046936677051852,3015450630482773918,53169280138087861700 %N A231527 Number of 5Xn 0..1 arrays with no element less than a strict majority of its horizontal, diagonal and antidiagonal neighbors. %C A231527 Row 5 of A231523 %H A231527 R. H. Hardin, <a href="/A231527/b231527.txt">Table of n, a(n) for n = 1..210</a> %e A231527 Some solutions for n=4 %e A231527 ..0..0..0..0....0..1..0..1....0..1..1..1....0..0..1..0....1..1..1..0 %e A231527 ..0..0..0..0....0..0..0..0....1..0..0..1....0..0..0..0....0..0..0..0 %e A231527 ..0..0..0..1....1..0..0..1....0..0..1..0....0..0..0..0....1..0..0..1 %e A231527 ..0..1..1..0....0..1..0..1....0..0..0..0....0..0..0..1....1..0..1..0 %e A231527 ..1..0..0..1....0..0..0..0....0..1..0..0....1..0..1..1....0..0..0..1 %K A231527 nonn %O A231527 1,1 %A A231527 _R. H. Hardin_, Nov 10 2013