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 A077548 #5 May 11 2007 03:00:00 %S A077548 2,7,65659969,5184705528587072464087 %N A077548 Duplicate of A050809. %K A077548 dead %O A077548 0,1