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 A122081 #6 Jun 22 2017 10:19:16 %S A122081 1,1,3,14,115,2086,101791,14835870,6852422567,10338780759514, %T A122081 51804974736769271 %N A122081 Duplicate of A007140. %K A122081 dead %O A122081 0,3