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 A053345 #6 May 11 2007 03:00:00 %S A053345 279,415,711,115807 %N A053345 Duplicate of A032505. %K A053345 dead %O A053345 1,1