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 A201229 #7 Jul 22 2025 16:10:02 %S A201229 6,2,34,24,306,152,2697,1709,26353,14274,256132,155679,2577102, %T A201229 1435626,25812024,15341134,262850473,148007489,2677750617,1572346141, %U A201229 27580713570,15652657223,284558852486,165998453918,2956634276151,1686097239526 %N A201229 Number of nX2 0..3 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 A201229 Column 2 of A201235 %H A201229 R. H. Hardin, <a href="/A201229/b201229.txt">Table of n, a(n) for n = 1..82</a> %e A201229 Some solutions for n=10 %e A201229 ..0..0....0..1....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0 %e A201229 ..0..0....0..1....0..0....0..0....0..1....0..0....0..0....0..0....0..1....0..1 %e A201229 ..0..2....0..1....0..1....0..2....0..2....0..1....0..2....0..3....0..2....0..1 %e A201229 ..2..2....0..1....1..3....1..1....0..1....1..1....1..1....1..1....0..1....0..3 %e A201229 ..3..3....0..3....1..1....1..1....2..3....2..2....1..2....1..3....1..3....2..2 %e A201229 ..1..3....2..2....1..3....1..3....3..3....1..3....2..3....1..3....3..3....1..2 %e A201229 ..1..2....3..3....2..3....2..3....2..2....2..2....1..2....2..2....2..3....3..3 %e A201229 ..1..3....2..3....2..2....3..3....1..2....1..2....1..2....1..3....1..2....2..3 %e A201229 ..1..2....1..3....3..3....2..3....1..3....3..3....3..3....2..3....2..3....1..3 %e A201229 ..1..3....2..2....2..2....2..2....1..3....3..3....3..3....2..2....1..2....1..2 %K A201229 nonn %O A201229 1,1 %A A201229 _R. H. Hardin_ Nov 28 2011