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 A075672 #4 May 11 2007 03:00:00 %S A075672 1,13,405,23058,2078375,271739011,48574262275,11373936899396 %N A075672 Duplicate of A069876. %K A075672 dead %O A075672 1,2