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 A222376 #6 Jul 23 2025 02:32:57 %S A222376 5,63,498,20340,271141,16985929,286125939,20743320247,373691424190, %T A222376 27882988244881,509605326368069,38307687628079400,703184052898346968, %U A222376 52999539133762131621,974700127061083249468,73589121388228405830161 %N A222376 Number of nX5 0..3 arrays with no more than floor(nX5/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order. %C A222376 Column 5 of A222378 %H A222376 R. H. Hardin, <a href="/A222376/b222376.txt">Table of n, a(n) for n = 1..21</a> %e A222376 Some solutions for n=4 %e A222376 ..0..0..0..0..1....0..0..1..0..2....0..0..0..1..2....0..0..1..1..1 %e A222376 ..0..0..0..1..1....0..0..3..0..1....0..0..0..1..0....0..1..1..1..1 %e A222376 ..0..0..2..0..1....0..0..0..0..0....0..0..0..0..1....0..2..1..1..1 %e A222376 ..0..0..0..1..1....0..0..0..0..0....0..0..0..0..2....0..2..1..1..1 %K A222376 nonn %O A222376 1,1 %A A222376 _R. H. Hardin_ Feb 17 2013