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 A231749 #6 Jul 23 2025 06:39:53 %S A231749 22,186,5106,101517,1787168,36596191,764681711,15421779553, %T A231749 309633476778,6284893573378,127697430555401,2587148736974819, %U A231749 52408991398868709,1062536884554302876,21542235015238071587,436659223538195787389 %N A231749 Number of nX4 0..2 arrays with no element less than a strict majority of its horizontal, vertical, diagonal and antidiagonal neighbors. %C A231749 Column 4 of A231753 %H A231749 R. H. Hardin, <a href="/A231749/b231749.txt">Table of n, a(n) for n = 1..210</a> %e A231749 Some solutions for n=4 %e A231749 ..0..0..1..1....0..0..0..2....2..2..2..0....2..2..1..2....0..0..2..1 %e A231749 ..1..0..0..1....1..0..0..0....0..0..0..0....0..0..0..0....0..0..0..1 %e A231749 ..2..0..0..2....0..0..0..2....0..0..0..0....0..0..0..0....0..0..0..0 %e A231749 ..1..1..0..0....0..0..2..2....0..1..2..0....1..0..2..2....1..1..1..0 %K A231749 nonn %O A231749 1,1 %A A231749 _R. H. Hardin_, Nov 13 2013