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 A068296 #12 Jun 26 2017 01:24:42 %S A068296 1,120,161280,2451486720,421421199390720,819296954885530030080, %T A068296 18013654371239090908333148160,4479149596637688119857975807616194560, %U A068296 12595676735919821000208123310178819903753287680,400570738126155220679966449710339235598075113573822617600 %N A068296 1/7 the number of colorings of an n X n octagonal array with 7 colors. %Y A068296 Cf. A068239-A068305, A000332, A002417, A027441, A212208, A212209. %K A068296 nonn %O A068296 1,2 %A A068296 _R. H. Hardin_, Feb 24 2002 %E A068296 a(6)-a(8) from _Alois P. Heinz_, May 04 2012 %E A068296 a(9)-a(10) from _Andrew Howroyd_, Jun 25 2017