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 A182104 #13 Dec 28 2015 10:39:43 %S A182104 1,3,13,105,1681,53793,3442753,440672385,112812130561 %N A182104 Duplicate of A073587. %K A182104 dead %O A182104 0,2