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 A274103 #5 Jun 12 2016 13:07:08 %S A274103 3,6,17,66,327 %N A274103 Erroneous version of A003323. %C A274103 Included in accordance with OEIS policy of including published but erroneous sequences, to serve as pointers to the correct entries. %K A274103 dead %O A274103 1,1