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 A201065 #8 May 04 2021 21:56:12 %S A201065 7,70,514,22440,2250982,45244488,1001060834,1438433201164 %N A201065 Number of n X n 0..6 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other. %C A201065 Diagonal of A201072. %e A201065 Some solutions for n=4 %e A201065 ..0..0..2..2....0..1..1..1....0..0..3..3....0..1..1..3....0..0..3..3 %e A201065 ..1..1..4..4....0..2..2..4....0..2..3..4....0..2..4..6....0..2..4..4 %e A201065 ..1..3..5..6....3..3..4..5....1..2..5..6....1..2..4..6....1..2..5..6 %e A201065 ..3..5..5..6....5..6..6..6....1..4..5..6....3..5..5..6....1..3..5..6 %Y A201065 Cf. A201072. %K A201065 nonn %O A201065 1,1 %A A201065 _R. H. Hardin_ Nov 26 2011