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 A267664 #4 Jan 19 2016 08:05:57 %S A267664 7,98,1372,10933,80404,528980,3351233,20607770,124968034,751679881, %T A267664 4503526606,26944093086,161168152537,964705429660,5780078807152, %U A267664 34674075257785,208263171976478,1252461099135084,7541064630678427 %N A267664 Number of nX5 0..1 arrays with every repeated value in every row unequal to the previous repeated value, and in every column equal to the previous repeated value, and new values introduced in row-major sequential order. %C A267664 Column 5 of A267667. %H A267664 R. H. Hardin, <a href="/A267664/b267664.txt">Table of n, a(n) for n = 1..210</a> %e A267664 Some solutions for n=5 %e A267664 ..0..0..1..0..1....0..1..1..0..1....0..1..0..1..1....0..1..0..0..1 %e A267664 ..0..1..1..0..0....1..0..0..1..1....0..1..1..0..0....1..0..0..1..0 %e A267664 ..0..1..0..0..1....0..0..1..0..1....1..0..0..1..0....0..1..0..0..1 %e A267664 ..0..1..1..0..1....0..0..1..1..0....0..1..0..0..1....0..1..0..0..1 %e A267664 ..1..0..1..1..0....0..1..1..0..1....1..0..1..0..0....0..1..1..0..1 %Y A267664 Cf. A267667. %K A267664 nonn %O A267664 1,1 %A A267664 _R. H. Hardin_, Jan 19 2016