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 A231582 #7 Jul 23 2025 06:35:18 %S A231582 16,124,2352,32650,381076,5618444,82479418,1142396851,16061107556, %T A231582 231334122108,3304782498636,47013530431780,672506204379038, %U A231582 9632530214937964,137769361857359282,1971267194035271726 %N A231582 Number of nX3 0..3 arrays with no element less than a strict majority of its horizontal, vertical, diagonal and antidiagonal neighbors. %C A231582 Column 3 of A231586 %H A231582 R. H. Hardin, <a href="/A231582/b231582.txt">Table of n, a(n) for n = 1..210</a> %H A231582 R. H. Hardin, <a href="/A231582/a231582.txt">Empirical recurrence of order 72</a> %F A231582 Empirical recurrence of order 72 (see link above) %e A231582 Some solutions for n=4 %e A231582 ..1..0..0....3..0..1....1..0..3....0..2..3....2..2..1....2..3..1....1..1..1 %e A231582 ..0..0..3....0..0..0....0..0..0....0..0..2....1..0..0....2..1..1....2..1..1 %e A231582 ..0..3..0....0..0..0....3..0..1....0..0..3....0..0..0....0..0..3....3..1..1 %e A231582 ..2..0..0....3..3..3....0..0..0....0..1..2....0..3..0....0..0..0....2..1..1 %K A231582 nonn %O A231582 1,1 %A A231582 _R. H. Hardin_, Nov 11 2013