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 A117075 #6 Mar 07 2015 06:01:07 %S A117075 3,6,11,22,42,84,168,336,672,1342,2684,5368,10736,21472,42944,85888, %T A117075 171776 %N A117075 Number at end of segment n of A117073. %D A117075 N. J. A. Sloane and Allan Wilks, On sequences of Recaman type, paper in preparation, 2006. %Y A117075 Equals A117074(n) + 2. %K A117075 nonn %O A117075 1,1 %A A117075 _N. J. A. Sloane_, Apr 18 2006