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 A078748 #4 May 11 2007 03:00:00 %S A078748 2,5,877,27644437,35742549198872617291353508656626642567 %N A078748 Duplicate of A051131. %K A078748 dead %O A078748 1,1