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 A117074 #6 Mar 07 2015 05:58:21 %S A117074 1,4,9,20,40,82,166,334,670,1340,2682,5366,10734,21470,42942,85886, %T A117074 171774 %N A117074 Number at start of segment n of A117073. %D A117074 N. J. A. Sloane and Allan Wilks, On sequences of Recaman type, paper in preparation, 2006. %K A117074 nonn %O A117074 1,2 %A A117074 _N. J. A. Sloane_, Apr 17 2006