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 A222324 #6 Jul 23 2025 02:29:37 %S A222324 3,7,19,52,165,835,3307,14419,66213,302731,1350601,6283864,28864821, %T A222324 132830017,617677553,2862431936,13363660417,62171655121,291908874951, %U A222324 1362607426103,6418589261153,30080186463929,142028701850239 %N A222324 Number of nX4 0..1 arrays with exactly floor(nX4/2) elements unequal to at least one king-move neighbor, with new values introduced in row major 0..1 order. %C A222324 Column 4 of A222328 %H A222324 R. H. Hardin, <a href="/A222324/b222324.txt">Table of n, a(n) for n = 1..210</a> %e A222324 Some solutions for n=4 %e A222324 ..0..0..0..0....0..1..1..1....0..0..0..1....0..0..0..0....0..0..0..1 %e A222324 ..0..0..0..1....0..1..1..1....1..1..1..1....0..0..0..0....0..0..0..0 %e A222324 ..0..0..0..1....0..1..1..1....1..1..1..1....1..0..0..0....0..0..0..1 %e A222324 ..0..0..0..0....1..1..1..1....1..1..1..1....1..1..0..0....0..0..0..0 %K A222324 nonn %O A222324 1,1 %A A222324 _R. H. Hardin_ Feb 15 2013