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 A222773 #6 Jul 23 2025 03:03:11 %S A222773 0,48,301,3431,19766,256546,1570588,21526008,136549058,1916013454, %T A222773 12429454430,176824724591,1163475046332,16694274193142, %U A222773 110869265032135,1600019787081011,10694449471174787,154977656102006006 %N A222773 Number of 5Xn 0..1 arrays with exactly floor(5Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order. %C A222773 Row 5 of A222769 %H A222773 R. H. Hardin, <a href="/A222773/b222773.txt">Table of n, a(n) for n = 1..39</a> %e A222773 Some solutions for n=3 %e A222773 ..0..0..0....0..1..1....0..0..0....0..0..0....0..1..0....0..0..0....0..0..0 %e A222773 ..1..1..1....1..1..1....0..0..0....0..1..1....0..0..0....0..0..0....0..0..0 %e A222773 ..1..1..1....0..1..1....1..0..0....0..1..1....0..0..0....0..0..1....0..1..1 %e A222773 ..1..1..1....1..1..1....0..0..0....1..1..1....0..0..1....0..1..1....1..1..0 %e A222773 ..1..0..0....1..1..0....1..0..1....1..1..0....0..0..0....0..1..0....1..0..0 %K A222773 nonn %O A222773 1,2 %A A222773 _R. H. Hardin_ Mar 05 2013