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 A141016 #18 Jul 28 2015 16:03:46 %S A141016 0,1,2,4,9,20,44,97,214,472,1041,2296,5064,11169,24634,54332 %N A141016 Duplicate of A008998. %K A141016 dead %O A141016 0,3 %A A141016 _Juri-Stepan Gerasimov_, Jul 11 2008