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 A201031 #6 Jul 22 2025 16:04:01 %S A201031 61,4587,249211,6814915,78447852,21586894705 %N A201031 Number of nX6 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 A201031 Column 6 of A201033 %e A201031 Some solutions for n=3 %e A201031 ..0..0..1..2..1..3....0..0..1..1..1..3....0..0..0..1..1..3....0..0..1..2..1..3 %e A201031 ..0..1..3..2..3..4....0..0..2..4..3..4....0..2..4..2..3..4....0..1..3..2..2..4 %e A201031 ..0..1..2..2..4..4....1..2..2..4..3..4....1..1..3..3..2..4....0..1..4..3..3..4 %K A201031 nonn %O A201031 1,1 %A A201031 _R. H. Hardin_ Nov 26 2011