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 A055511 #2 May 16 2003 03:00:00 %S A055511 3,5,11,41,89,317,337,991,1873,2053,2377,4093,4297,4583,6569,13033, %T A055511 15877 %N A055511 Erroneous version of A006794. %K A055511 dead %O A055511 1,1