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 A222764 #6 Jul 23 2025 03:02:03 %S A222764 0,4,13,96,301,2242,7575,55958,196442,1448568,5188656,38338122, %T A222764 138866688,1029494580,3754449699,27929878716,102325331440, %U A222764 763577070328,2806916894109,21001612120424,77405327921654,580452846750048 %N A222764 Number of nX3 0..1 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order. %C A222764 Column 3 of A222769 %H A222764 R. H. Hardin, <a href="/A222764/b222764.txt">Table of n, a(n) for n = 1..210</a> %e A222764 Some solutions for n=3 %e A222764 ..0..0..0....0..0..0....0..0..0....0..1..0....0..1..0....0..0..0....0..1..1 %e A222764 ..0..0..0....0..0..0....1..1..1....0..0..0....1..1..1....0..0..0....1..1..1 %e A222764 ..0..1..0....1..1..1....1..1..1....0..0..0....1..1..1....1..0..1....1..1..0 %K A222764 nonn %O A222764 1,2 %A A222764 _R. H. Hardin_ Mar 05 2013