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 A200769 #8 Apr 26 2017 11:40:09 %S A200769 3,5,13,342,7725,91755,17965438,2189118202,159001066390 %N A200769 Number of n X n 0..2 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 A200769 Diagonal of A200777. %e A200769 Some solutions for n=4 %e A200769 ..0..0..1..1....0..0..0..0....0..0..0..1....0..0..0..1....0..0..0..0 %e A200769 ..0..2..1..2....0..0..1..2....0..0..2..1....0..0..1..1....0..1..1..2 %e A200769 ..0..1..1..2....1..1..2..2....0..2..1..1....0..1..1..2....0..1..1..1 %e A200769 ..0..2..1..2....1..1..2..2....1..2..2..2....2..2..2..2....2..2..2..2 %Y A200769 Cf. A200777. %K A200769 nonn %O A200769 1,1 %A A200769 _R. H. Hardin_, Nov 22 2011