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 A241325 #7 Jul 23 2025 11:12:14 %S A241325 5,530,68935,8949808,1162535788,151022716125,19619065042282, %T A241325 2548674277117248,331093294165744259,43011682813264944327, %U A241325 5587563659405034428031,725869475605161121443285 %N A241325 Number of nX4 0..3 arrays with no element equal to fewer vertical neighbors than horizontal neighbors, with new values 0..3 introduced in row major order. %C A241325 Column 4 of A241328 %H A241325 R. H. Hardin, <a href="/A241325/b241325.txt">Table of n, a(n) for n = 1..210</a> %H A241325 R. H. Hardin, <a href="/A241325/a241325.txt">Empirical recurrence of order 53</a> %F A241325 Empirical recurrence of order 53 (see link above) %e A241325 Some solutions for n=3 %e A241325 ..0..1..2..0....0..1..2..0....0..1..2..0....0..1..2..1....0..1..2..3 %e A241325 ..2..1..0..1....0..2..3..1....0..0..2..1....2..1..0..2....2..1..2..2 %e A241325 ..1..3..1..3....1..3..2..0....2..0..1..2....1..0..1..0....3..1..3..2 %K A241325 nonn %O A241325 1,1 %A A241325 _R. H. Hardin_, Apr 19 2014