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 A023812 #5 May 11 2007 03:00:00 %S A023812 0,2,21,228,2930,44790,800667,16434824,381367044,9876543210 %N A023812 Duplicate of A062813. %K A023812 dead %O A023812 1,2