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 A108247 #10 Sep 19 2013 19:21:23 %S A108247 1,1,10,760,190050,103050570,102359800620,168076482974400 %N A108247 Duplicate of A108243. %K A108247 dead %O A108247 0,3