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 A243281 #20 Jun 19 2014 20:59:12 %S A243281 1,2,9,66,1244,32524,1114549,47513547,2401002993,140026612346 %N A243281 Number of inequivalent (mod D_8) ways to place n nonattacking knights on an n X n board. %H A243281 <a href="/A243281/b243281.txt">Table of n, a(n) for n = 1..10</a> %Y A243281 Cf. A201540, A243716. %K A243281 nonn,hard %O A243281 1,2 %A A243281 _Heinrich Ludwig_, Jun 19 2014