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 A064177 #2 Sep 13 2003 03:00:00 %S A064177 1,5,6,353,72,1141 %N A064177 Erroneous version of A007666. %K A064177 dead %O A064177 1,2