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 A081497 #3 May 11 2007 03:00:00 %S A081497 1,3,8,26,90,322,1176,4356,16302,61490,233376,890188,3409588,13104756 %N A081497 Duplicate of A028270. %K A081497 dead %O A081497 0,2