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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.

A201209 Number of n X n 0..3 arrays with every row and column running average nondecreasing rightwards and downwards.

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%I A201209 #8 Jul 22 2025 16:09:07
%S A201209 4,50,1684,146946,33635880,21062625664,37432954261477
%N A201209 Number of n X n 0..3 arrays with every row and column running average nondecreasing rightwards and downwards.
%C A201209 Diagonal of A201216
%e A201209 Some solutions for n=3
%e A201209 ..0..2..2....0..1..2....1..1..2....1..1..2....0..0..1....0..0..0....0..0..0
%e A201209 ..0..2..3....0..1..3....1..2..2....1..3..3....0..2..2....0..1..2....1..1..1
%e A201209 ..2..3..3....0..2..3....2..3..3....1..2..3....3..3..3....1..1..1....1..3..3
%K A201209 nonn
%O A201209 1,1
%A A201209 _R. H. Hardin_ Nov 28 2011

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