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 A201027 #7 Jul 22 2025 16:03:33 %S A201027 10,10,41,295,159,4587,8476,33401,272191,128622,4546620,8993979, %T A201027 36684736,308393680,140796536,5332902231,10823034414,44858965451, %U A201027 380690718127,170636868384,6712393127261,13840721168804,57974199126361 %N A201027 Number of nX2 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 A201027 Column 2 of A201033 %H A201027 R. H. Hardin, <a href="/A201027/b201027.txt">Table of n, a(n) for n = 1..50</a> %e A201027 Some solutions for n=3 %e A201027 ..0..2....0..2....0..0....0..1....0..1....0..1....0..2....0..3....0..1....0..2 %e A201027 ..1..2....0..3....1..4....2..4....2..3....1..4....1..3....2..3....0..2....2..3 %e A201027 ..3..4....1..4....2..3....1..3....1..4....2..3....1..4....1..4....3..4....1..4 %K A201027 nonn %O A201027 1,1 %A A201027 _R. H. Hardin_ Nov 26 2011