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 A097874 #4 Nov 10 2007 03:00:00 %S A097874 1,1,2,4,8,1,17,4,37,13,1,82,40,5,185,116,21,1,423,326,80,6,978,899, %T A097874 279 %N A097874 Duplicate of A097885. %K A097874 dead %O A097874 0,3