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 A251799 #6 Jun 02 2025 10:32:05 %S A251799 905440,195753488,43510308650,10280556043804,2466029519190492, %T A251799 596244004665414586,144607697103715449366,35128978291327271678332, %U A251799 8539742853066868800341654,2076797685218066186814306236 %N A251799 Number of (n+1)X(6+1) 0..3 arrays with no 2X2 subblock having x11-x00 less than x10-x01. %C A251799 Column 6 of A251801 %H A251799 R. H. Hardin, <a href="/A251799/b251799.txt">Table of n, a(n) for n = 1..210</a> %e A251799 Some solutions for n=1 %e A251799 ..0..0..0..0..2..1..3....0..0..2..2..3..3..3....0..2..3..3..2..3..3 %e A251799 ..0..2..2..2..1..3..2....0..2..1..1..0..3..3....0..0..0..0..1..1..2 %K A251799 nonn %O A251799 1,1 %A A251799 _R. H. Hardin_, Dec 09 2014