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 A267642 #4 Jan 18 2016 20:11:04 %S A267642 11,242,1353,12623,47715,343145,1117207,7479533,22499181,150415627, %T A267642 429242911,2954085199,8086558295,58043181513,153186588731, %U A267642 1151896473495,2939148319421,23154681921613,57239339798173,471401152901559 %N A267642 Number of nX6 0..1 arrays with every repeated value in every row and column unequal to the previous repeated value, and new values introduced in row-major sequential order. %C A267642 Column 6 of A267644. %H A267642 R. H. Hardin, <a href="/A267642/b267642.txt">Table of n, a(n) for n = 1..210</a> %e A267642 Some solutions for n=5 %e A267642 ..0..0..1..0..1..0....0..1..0..0..1..0....0..1..0..1..1..0....0..1..0..1..1..0 %e A267642 ..1..0..1..0..1..0....0..0..1..0..1..1....1..0..1..1..0..1....0..0..1..1..0..0 %e A267642 ..0..1..0..1..0..1....1..0..1..1..0..0....1..1..0..0..1..0....1..1..0..0..1..1 %e A267642 ..1..0..0..1..1..0....0..1..0..1..1..0....0..0..1..0..1..0....1..1..0..0..1..1 %e A267642 ..0..1..1..0..0..1....1..0..1..0..0..1....1..1..0..1..0..1....0..0..1..1..0..0 %Y A267642 Cf. A267644. %K A267642 nonn %O A267642 1,1 %A A267642 _R. H. Hardin_, Jan 18 2016