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 A200772 #7 Jul 22 2025 15:55:30 %S A200772 2,5,13,31,77,217,553,1438,3849,9634,24872,65658,165619,425229, %T A200772 1108871,2787741,7090082,18273124,45935694,116433625,297919225, %U A200772 747625324,1886048964,4791865798,11998842755,30184656867,76352766306,190890209361 %N A200772 Number of nX3 0..2 arrays with every row and column running average nondecreasing rightwards and downwards, and the number of instances of each value within one of each other. %C A200772 Column 3 of A200777 %H A200772 R. H. Hardin, <a href="/A200772/b200772.txt">Table of n, a(n) for n = 1..99</a> %e A200772 Some solutions for n=4 %e A200772 ..0..0..0....0..1..1....0..0..1....0..0..1....0..0..1....0..1..1....0..0..2 %e A200772 ..0..2..2....0..2..1....0..0..2....0..1..1....0..1..2....0..1..1....0..0..2 %e A200772 ..1..1..2....0..2..1....1..2..2....0..2..1....0..1..2....0..2..2....1..1..2 %e A200772 ..1..1..2....0..2..2....1..1..2....2..2..2....1..2..2....0..2..2....1..1..2 %K A200772 nonn %O A200772 1,1 %A A200772 _R. H. Hardin_ Nov 22 2011