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 A163118 #6 Jan 04 2013 16:07:20 %S A163118 0,0,2,2,6,6,8,7,1,1,7,6,2,2,4,3,3,3,1,1,3,2,2,2,4,3,5,5,1,0,6,6,4,4, %T A163118 2,1,5,5,1,0,2,7,0,0,1,1,1,1,2,2,3,3,3,3,3,3,4,4,5,5,6,6,6,6,6,6,8,8, %U A163118 9,9,9,9,9,8,1,1,1,1,0,0,1,1,1,1,4,4,4,4,5,5,6,6,7,7,7,7,8,7,2,2,1,1,1,1,0 %N A163118 Absolute values of the first differences of A163117. %F A163118 a(n) = |A163117(n+1)-A163117(n)|. %Y A163118 Cf. A093339, A162908, A163117. %K A163118 nonn,base %O A163118 1,3 %A A163118 _Juri-Stepan Gerasimov_, Jul 21 2009 %E A163118 a(7) and a(8) corrected by _R. J. Mathar_, Jul 31 2009