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 A200773 #7 Jul 22 2025 15:55:37 %S A200773 7,20,31,342,1368,1806,18801,66784,80772,855668,3041384,3594128, %T A200773 37388832,130414591,152057520,1585602417,5503438740,6353866245, %U A200773 65731117389,226849040721,260912168378,2698875915314,9278417689608,10609858568929 %N A200773 Number of nX4 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 A200773 Column 4 of A200777 %H A200773 R. H. Hardin, <a href="/A200773/b200773.txt">Table of n, a(n) for n = 1..43</a> %e A200773 Some solutions for n=5 %e A200773 ..0..0..1..1....0..0..0..1....0..0..0..1....0..0..0..1....0..0..0..0 %e A200773 ..0..0..1..1....0..0..1..1....0..2..1..1....0..2..1..1....0..1..1..1 %e A200773 ..0..0..2..2....0..2..1..2....0..1..2..1....0..1..1..1....0..1..1..2 %e A200773 ..0..2..2..2....1..1..1..2....0..2..1..2....0..2..2..2....0..2..1..2 %e A200773 ..1..1..2..2....2..2..2..2....1..2..2..2....1..2..2..2....2..2..2..2 %K A200773 nonn %O A200773 1,1 %A A200773 _R. H. Hardin_ Nov 22 2011