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 A044965 #5 Mar 30 2012 18:56:49 %S A044965 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,17,34,51,68,85,102,119,136,153, %T A044965 170,187,204,221,238,255,256,257,272,273,274,275,276,277,278,279,280, %U A044965 281,282,283,284,285,286,287,289,290,305,307,321 %N A044965 Numbers with no two equally numerous base 16 digits. %K A044965 nonn,base %O A044965 1,2 %A A044965 _Clark Kimberling_