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 A075755 #4 Jan 09 2009 03:00:00 %S A075755 1,10,63,505,5050,47899,466237,4662370,46308087,461504593,4615045930 %N A075755 Duplicate of A046638. %K A075755 dead %O A075755 0,2