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 A163281 #5 Feb 15 2014 12:32:58 %S A163281 1,2,-1,3,3,-4,3,4,4,-9,3,5,5,5,-14,3,4,6,6,6,-23,9,-1,7,7,7,7,-32,9, %T A163281 1,5,8,8,8,8,-45,15,-1,11,1,9,9,9,9,-58,15,1,13,-2,10,10,10,10,10,-71, %U A163281 17,5,17,-13,11,11,11,11,11,11,-90,27,-1,19,-11 %N A163281 First differences of A163280. %Y A163281 Cf. A161344, A163280, A163983, A164000. %K A163281 sign %O A163281 1,2 %A A163281 _Omar E. Pol_, Aug 08 2009 %E A163281 More terms from _Michel Marcus_, Feb 15 2014