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 A235447 #6 Oct 02 2021 16:10:03 %S A235447 9418,657290,44920240,3043145826,205551169550,13868068262164, %T A235447 935263088301396,63064724124453082,4252224342324710504, %U A235447 286706640921161498010,19331099358385310094498,1303390076791046628378510 %N A235447 Number of (n+1) X (6+1) 0..1 arrays with the difference between each 2 X 2 subblock maximum and minimum lexicographically nondecreasing rowwise and columnwise. %C A235447 Column 6 of A235449. %H A235447 R. H. Hardin, <a href="/A235447/b235447.txt">Table of n, a(n) for n = 1..210</a> %e A235447 Some solutions for n=1 %e A235447 ..1..1..0..0..1..1..0....0..0..0..1..1..1..0....0..0..0..1..1..1..1 %e A235447 ..0..0..1..0..0..0..1....0..0..0..0..0..0..0....1..1..0..0..1..0..0 %Y A235447 Cf. A235449. %K A235447 nonn %O A235447 1,1 %A A235447 _R. H. Hardin_, Jan 10 2014