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 A068263 #8 Apr 27 2012 17:30:44 %S A068263 1,1596,312900732,7535656472652144,22293406028991258906822012, %T A068263 8101633271611742223009066926458678872, %U A068263 361667559847367304628616562064628954963501797097616,1983295161343761814393139138003147798350023823439773839309854050176 %N A068263 1/13 the number of colorings of an n X n square array with 13 colors. %Y A068263 Cf. A068239-A068305, A000332, A002417, A027441, A182368, A182406. %K A068263 nonn %O A068263 1,2 %A A068263 _R. H. Hardin_, Feb 24 2002 %E A068263 a(5)-a(8) from _Alois P. Heinz_, Apr 27 2012