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 A229605 #9 Apr 27 2021 21:29:04 %S A229605 120,15795,792929,31848813,1153135492,39229935270,1279020266434, %T A229605 40413033646242,1246326317951687,37697561397216125, %U A229605 1122224822297521683,32965710304040001780,957481537679788357971,27540249663372893582723 %N A229605 Number of defective 3-colorings of an n X 7 0..2 array connected horizontally and vertically with exactly two mistakes, and colors introduced in row-major 0..2 order. %C A229605 Column 7 of A229606. %H A229605 R. H. Hardin, <a href="/A229605/b229605.txt">Table of n, a(n) for n = 1..210</a> %H A229605 R. H. Hardin, <a href="/A229605/a229605.txt">Empirical recurrence of order 46</a> %F A229605 Empirical recurrence of order 46 (see link above). %e A229605 Some solutions for n=3: %e A229605 0 1 2 0 1 2 1 0 1 2 0 1 0 0 0 1 2 1 0 2 0 %e A229605 0 2 1 2 0 1 2 0 2 0 1 2 1 2 0 2 1 0 1 0 1 %e A229605 2 0 2 1 0 2 1 2 1 2 0 1 2 1 1 0 2 1 0 2 2 %Y A229605 Cf. A229606. %K A229605 nonn %O A229605 1,1 %A A229605 _R. H. Hardin_, Sep 26 2013