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 A222283 #6 Jul 23 2025 02:28:19 %S A222283 1,0,0,3,4,4,5,20,27,48,63,175,236,512,684,1719,2320,5400,7271,17776, %T A222283 24036,57420,77636,188656,255591,617176,836595,2033175,2759184, %U A222283 6697744,9094949,22139780,30086955,73262232,99615081,242931321,330503120 %N A222283 Number of nX1 0..1 arrays with exactly floor(nX1/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..1 order. %C A222283 Column 1 of A222290 %H A222283 R. H. Hardin, <a href="/A222283/b222283.txt">Table of n, a(n) for n = 1..210</a> %e A222283 All solutions for n=4 %e A222283 ..0....0....0 %e A222283 ..1....0....0 %e A222283 ..1....0....1 %e A222283 ..1....1....1 %K A222283 nonn %O A222283 1,4 %A A222283 _R. H. Hardin_ Feb 14 2013