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 A068269 #8 Apr 27 2012 17:39:15 %S A068269 1,5526,8882874018,4153630571837864748,564981170863476314096512687566, %T A068269 22354853275061169487985050625489956484533056, %U A068269 257300965334378745090532920060644632998190650709754736514068,861475141050998806961235302195978945049151803599433480523424276423626596675468 %N A068269 1/19 the number of colorings of an n X n square array with 19 colors. %Y A068269 Cf. A068239-A068305, A000332, A002417, A027441, A182368, A182406. %K A068269 nonn %O A068269 1,2 %A A068269 _R. H. Hardin_, Feb 24 2002 %E A068269 a(5)-a(8) from _Alois P. Heinz_, Apr 27 2012