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 A200771 #7 Jul 22 2025 15:55:24 %S A200771 3,5,5,20,37,31,144,273,218,1054,2009,1574,7738,14793,11474,57029, %T A200771 109296,84246,421938,810268,621914,3132630,6025862,4611044,23331465, %U A200771 44944997,34314054,174267851,336126752,256168546,1304988740,2519821169,1917689311 %N A200771 Number of nX2 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 A200771 Column 2 of A200777 %H A200771 R. H. Hardin, <a href="/A200771/b200771.txt">Table of n, a(n) for n = 1..210</a> %e A200771 Some solutions for n=4 %e A200771 ..0..1....0..1....0..0....0..0....0..1....0..0....0..1....0..1....0..1....0..0 %e A200771 ..0..1....0..1....0..2....0..2....0..1....1..1....0..1....0..2....0..2....0..2 %e A200771 ..1..2....0..2....1..1....1..2....0..2....2..2....2..2....0..2....1..2....1..1 %e A200771 ..2..2....2..2....1..2....1..2....1..2....1..2....1..2....1..2....1..2....2..2 %K A200771 nonn %O A200771 1,1 %A A200771 _R. H. Hardin_ Nov 22 2011