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 A240654 #6 Jul 23 2025 11:05:36 %S A240654 1,10,136,1545,16629,184819,2076117,23697768,272201307,3137010024, %T A240654 36217287513,418547014847,4839698233313,55979951123885, %U A240654 647628362479276,7493125930415564,86701026167433662,1003225793066345318 %N A240654 Number of nX6 0..1 arrays with no element equal to exactly one horizontal or vertical neighbor, with new values 0..1 introduced in row major order. %C A240654 Column 6 of A240656 %H A240654 R. H. Hardin, <a href="/A240654/b240654.txt">Table of n, a(n) for n = 1..210</a> %e A240654 Some solutions for n=4 %e A240654 ..0..0..1..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0....0..1..1..0..1..1 %e A240654 ..0..0..0..0..0..0....0..0..0..0..1..0....0..1..1..0..0..0....1..1..1..1..1..1 %e A240654 ..0..0..0..0..0..0....0..0..0..1..0..0....0..1..1..0..1..0....1..1..1..1..0..0 %e A240654 ..0..0..1..0..0..1....0..0..0..0..0..1....0..0..0..0..0..0....0..1..1..1..0..0 %K A240654 nonn %O A240654 1,2 %A A240654 _R. H. Hardin_, Apr 09 2014