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 A222507 #6 Jul 23 2025 02:41:27 %S A222507 4,32,170,1753,17674,195968,2220730,25587208,297738400,3488244716, %T A222507 41065342664,485089112208,5747074198174,68246839505398, %U A222507 812175659130854,9682643419696866,115625719032846238,1382757381681066972 %N A222507 Number of nX6 0..1 arrays with exactly floor(nX6/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order. %C A222507 Column 6 of A222509 %H A222507 R. H. Hardin, <a href="/A222507/b222507.txt">Table of n, a(n) for n = 1..57</a> %e A222507 Some solutions for n=3 %e A222507 ..0..0..1..0..0..0....0..0..0..0..0..0....0..0..1..1..1..0....0..0..0..0..0..0 %e A222507 ..0..0..0..0..0..1....0..0..0..0..1..1....1..1..1..1..1..1....0..0..0..0..0..0 %e A222507 ..0..0..0..0..0..0....0..0..0..0..0..0....1..1..1..1..1..1....1..0..0..1..0..1 %K A222507 nonn %O A222507 1,1 %A A222507 _R. H. Hardin_ Feb 23 2013