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 A208350 #7 Jun 02 2025 07:44:06 %S A208350 51,7780,153237,4773885,191586797,8045978096,340596199800, %T A208350 14513602070899,621231491393354,26619820042892506,1141266433540198765, %U A208350 48945495491297801080,2099487944721769270814,90063058254133100176716 %N A208350 Number of nX5 0..3 arrays with new values 0..3 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors). %C A208350 Column 5 of A208353 %H A208350 R. H. Hardin, <a href="/A208350/b208350.txt">Table of n, a(n) for n = 1..29</a> %e A208350 Some solutions for n=4 %e A208350 ..0..1..0..2..2....0..0..1..0..2....0..0..0..0..0....0..0..0..0..1 %e A208350 ..2..3..3..2..2....2..1..1..2..2....1..2..1..1..1....1..2..2..2..2 %e A208350 ..0..1..3..1..0....2..3..3..3..3....2..2..2..3..2....1..1..3..3..3 %e A208350 ..0..0..1..0..1....2..0..0..0..0....0..0..3..0..0....0..0..0..3..0 %K A208350 nonn %O A208350 1,1 %A A208350 _R. H. Hardin_ Feb 25 2012