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 A222323 #6 Jul 23 2025 02:29:30 %S A222323 0,0,4,19,0,84,212,1366,1302,11152,21206,132937,213292,1337380, %T A222323 2647514,15028233,29622012,163019148,347100284,1830194472,3971385578, %U A222323 20474549872,45912542370,231923364114,527948983676,2633446191848,6087316332422 %N A222323 Number of nX3 0..1 arrays with exactly floor(nX3/2) elements unequal to at least one king-move neighbor, with new values introduced in row major 0..1 order. %C A222323 Column 3 of A222328 %H A222323 R. H. Hardin, <a href="/A222323/b222323.txt">Table of n, a(n) for n = 1..210</a> %e A222323 Some solutions for n=4 %e A222323 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..1..0....0..1..1 %e A222323 ..0..0..0....0..0..1....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0 %e A222323 ..0..0..0....0..0..0....0..0..0....0..0..1....0..0..0....0..0..0....0..0..0 %e A222323 ..0..1..0....0..0..0....1..1..1....0..0..0....0..1..1....0..0..0....0..0..0 %K A222323 nonn %O A222323 1,3 %A A222323 _R. H. Hardin_ Feb 15 2013