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 A267930 #4 Jan 22 2016 10:07:53 %S A267930 60,3600,178068,8459154,376812420,16109362560,663451196118, %T A267930 26507885328672,1031599522028772,39244717326244854, %U A267930 1463429227285701348,53613261264275522982,1933276790525967340428,68725772580648925008792 %N A267930 Number of nX3 0..3 arrays with every repeated value in every row and column greater than the previous repeated value. %C A267930 Column 3 of A267933. %H A267930 R. H. Hardin, <a href="/A267930/b267930.txt">Table of n, a(n) for n = 1..210</a> %H A267930 R. H. Hardin, <a href="/A267930/a267930.txt">Empirical recurrence of order 81</a> %F A267930 Empirical recurrence of order 81 (see link above) %e A267930 Some solutions for n=3 %e A267930 ..2..3..3....2..2..3....0..1..3....0..1..1....1..0..0....1..2..2....0..1..2 %e A267930 ..1..0..2....0..1..3....2..1..3....2..0..0....3..0..1....3..2..1....1..2..2 %e A267930 ..3..1..1....0..2..0....0..0..2....2..2..1....2..2..0....3..0..0....2..2..1 %Y A267930 Cf. A267933. %K A267930 nonn %O A267930 1,1 %A A267930 _R. H. Hardin_, Jan 22 2016