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 A212934 #6 Oct 18 2021 16:29:01 %S A212934 1,1023,14230810,1075113010175,285912852294921876, %T A212934 207406617181155352354002,346763870885473008105706659876, %U A212934 1185276120077816152516945331537683455 %N A212934 Number of 5 X n 0..n-1 arrays with no column j greater than column j-1 in all rows. %C A212934 Row 5 of A212930. %H A212934 R. H. Hardin, <a href="/A212934/b212934.txt">Table of n, a(n) for n = 1..15</a> %e A212934 Some solutions for n=3 %e A212934 ..1..1..1....0..2..0....1..0..2....1..0..1....0..0..2....2..2..2....2..0..2 %e A212934 ..1..0..0....0..1..1....0..1..0....1..2..2....1..0..1....1..1..0....2..0..1 %e A212934 ..1..2..2....1..0..1....0..0..2....2..1..2....2..0..2....2..2..0....2..1..2 %e A212934 ..0..0..0....2..2..1....1..0..0....2..2..1....0..2..2....1..0..1....1..2..1 %e A212934 ..2..0..2....0..1..1....2..0..0....2..1..1....2..0..2....2..0..2....0..2..1 %Y A212934 Cf. A212930. %K A212934 nonn %O A212934 1,2 %A A212934 _R. H. Hardin_ May 31 2012