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 A078582 #4 May 11 2007 03:00:00 %S A078582 1,3,7,13,22,33,48,65,86,110,138,168,204,242,284,330,381,434,493,554 %N A078582 Duplicate of A051336. %K A078582 dead %O A078582 1,2