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 A222284 #6 Jul 23 2025 02:28:26 %S A222284 0,0,4,11,8,44,144,352,692,2488,6476,17095,43308,131488,340000,939959, %T A222284 2520616,7194232,19142160,53471296,145636612,407743540,1107902624, %U A222284 3092203004,8488056840,23644607144,64986279340,181063135999,499746197884 %N A222284 Number of nX2 0..1 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..1 order. %C A222284 Column 2 of A222290 %H A222284 R. H. Hardin, <a href="/A222284/b222284.txt">Table of n, a(n) for n = 1..210</a> %e A222284 Some solutions for n=4 %e A222284 ..0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0 %e A222284 ..0..0....1..0....0..1....0..0....1..1....0..0....1..0....0..1....0..0....0..0 %e A222284 ..1..1....0..0....0..0....1..0....1..1....0..0....1..1....1..1....0..1....0..1 %e A222284 ..1..1....0..0....0..0....0..0....1..1....1..1....1..1....1..1....1..1....0..0 %K A222284 nonn %O A222284 1,3 %A A222284 _R. H. Hardin_ Feb 14 2013