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 A222289 #6 Jul 23 2025 02:29:02 %S A222289 5,144,1427,40321,564838,17801910,262048125,8550246097,129184703815, %T A222289 4294346570524,66002018148195,2218403489369930,34478463977532598, %U A222289 1167416501197133512,18284642742630658357,622321211264493492467 %N A222289 Number of nX7 0..1 arrays with exactly floor(nX7/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..1 order. %C A222289 Column 7 of A222290 %H A222289 R. H. Hardin, <a href="/A222289/b222289.txt">Table of n, a(n) for n = 1..24</a> %e A222289 Some solutions for n=4 %e A222289 ..0..1..0..1..1..1..1....0..0..0..0..0..0..0....0..0..1..1..1..1..1 %e A222289 ..1..1..1..0..1..1..1....0..0..0..1..0..1..0....0..1..0..1..1..1..1 %e A222289 ..1..1..1..0..1..1..1....0..0..1..0..0..0..0....1..1..0..0..1..1..1 %e A222289 ..1..1..0..1..1..1..1....0..0..0..1..0..0..0....1..1..0..1..1..1..1 %K A222289 nonn %O A222289 1,1 %A A222289 _R. H. Hardin_ Feb 14 2013