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 A068304 #8 May 04 2012 18:18:38 %S A068304 1,2184,592510464,19977134899857408,83707407272669822670292992, %T A068304 43590120924896822733942257303419219968, %U A068304 2821017309275220614373517914989957826683223925291008,22689081840779777447950160850969786755578939429093239677401474639872 %N A068304 1/15 the number of colorings of an n X n octagonal array with 15 colors. %Y A068304 Cf. A068239-A068305, A000332, A002417, A027441, A212208, A212209. %K A068304 nonn %O A068304 1,2 %A A068304 _R. H. Hardin_, Feb 24 2002 %E A068304 a(5)-a(8) from _Alois P. Heinz_, May 04 2012