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 A231697 #6 Jul 23 2025 06:37:50 %S A231697 144,13260,2049855,286808607,34764511754,4333974317355, %T A231697 556835183317668,71067313709831125,9020067185976407959, %U A231697 1146622410485781036080,145894809076844042966799,18557178929287225291004307 %N A231697 Number of nX5 0..3 arrays with no element less than a strict majority of its horizontal, vertical and antidiagonal neighbors. %C A231697 Column 5 of A231700 %H A231697 R. H. Hardin, <a href="/A231697/b231697.txt">Table of n, a(n) for n = 1..210</a> %e A231697 Some solutions for n=2 %e A231697 ..1..1..2..2..2....1..1..2..1..1....2..1..1..2..1....0..0..2..3..3 %e A231697 ..3..1..1..1..1....3..1..1..3..1....2..1..1..1..1....0..1..2..3..3 %K A231697 nonn %O A231697 1,1 %A A231697 _R. H. Hardin_, Nov 12 2013