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 A104808 #2 Mar 30 2012 17:26:11 %S A104808 17,1499,2381,4502,7973,8447 %N A104808 Positions of 10 in A104807. %Y A104808 Cf. A104807. %K A104808 nonn,base %O A104808 1,1 %A A104808 _Zak Seidov_, Mar 26 2005