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 A117248 #6 Mar 07 2015 05:59:07 %S A117248 0,0,0,1,2,3,4,4,6,5,8,6,10,7,12,8,14,9,16,10,18,11,20,12,22,13,24,14, %T A117248 26,15,28,16,30,17,32,18,34,19,36,20,38,21,40,22,42,23,44,24,46,25,48, %U A117248 26,50,27,52,28,54,29,56,30,58,31,60,32,62,33,64,34,66,35,68,36 %N A117248 Number of down steps at start of segment n of A079051. %D A117248 N. J. A. Sloane and Allan Wilks, On sequences of Recaman type, paper in preparation, 2006. %F A117248 Past the first few terms, this is an interleaving of 3,4,5,6,... and 0,2,4,6,8,... %K A117248 nonn %O A117248 0,5 %A A117248 _N. J. A. Sloane_, Apr 29 2006