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 A075297 #3 May 11 2007 03:00:00 %S A075297 0,0,1,1,0,2,3,1,4,8,5,7,20,18,9,47,56,0,103,159,56,206,421,271,356, %T A075297 1048 %N A075297 Duplicate of A057597. %K A075297 dead %O A075297 0,6