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 A200530 #7 Jul 22 2025 15:51:04 %S A200530 19,146,905,4848,23925,111085,494555,2132979,8981773,37125420, %T A200530 151253915,609247412,2432002859,9638730963,37983584772,149003379789, %U A200530 582403346152,2269881052166,8826625108206,34261690527204,132805131519232 %N A200530 Number of nX4 0..2 arrays with every row and column running average nondecreasing rightwards and downwards. %C A200530 Column 4 of A200534 %H A200530 R. H. Hardin, <a href="/A200530/b200530.txt">Table of n, a(n) for n = 1..57</a> %e A200530 Some solutions for n=5 %e A200530 ..0..0..0..1....0..0..0..2....0..0..0..0....0..0..0..1....0..1..1..1 %e A200530 ..1..1..2..2....0..0..0..2....0..0..0..2....0..0..0..2....1..2..2..2 %e A200530 ..2..2..2..2....0..0..1..2....0..1..1..2....1..1..2..2....1..2..2..2 %e A200530 ..2..2..2..2....1..2..2..2....0..2..1..2....1..2..2..2....1..2..2..2 %e A200530 ..2..2..2..2....1..1..1..2....0..2..1..2....2..2..2..2....2..2..2..2 %K A200530 nonn %O A200530 1,1 %A A200530 _R. H. Hardin_ Nov 18 2011