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 A201028 #7 Jul 22 2025 16:03:40 %S A201028 17,41,296,4238,3602,249211,1055902,8657121,141222119,127874916, %T A201028 9959532190,42952255903,362588593757,6102371958391,5510612701449, %U A201028 446546458762938,1940123176320382,16627869936250796,282670200216013184 %N A201028 Number of nX3 0..4 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 A201028 Column 3 of A201033 %H A201028 R. H. Hardin, <a href="/A201028/b201028.txt">Table of n, a(n) for n = 1..20</a> %e A201028 Some solutions for n=4 %e A201028 ..0..1..2....0..0..1....0..0..1....0..0..1....0..1..1....0..0..1....0..0..2 %e A201028 ..0..1..3....0..2..4....1..2..2....1..1..4....0..1..3....1..4..4....1..3..2 %e A201028 ..1..2..4....1..2..3....1..4..4....3..4..4....3..3..4....2..2..3....2..4..4 %e A201028 ..2..3..4....1..3..4....3..3..4....2..2..3....2..2..4....2..3..3....1..4..3 %K A201028 nonn %O A201028 1,1 %A A201028 _R. H. Hardin_ Nov 26 2011