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 A133912 #7 Apr 19 2015 08:56:30 %S A133912 1,1,-1,1,1,-2,1,-1,1,1,-2,1,1,1,-3,1,-1,1,1,-2,1,-1,1,1,-2,1,1,1,-3, %T A133912 1,-1,1,1,-2,1,1,1,-3,1,1,1,1,-4,1,-1,1,1,-2,1,-1,1,1,-2,1,1,1,-3,1, %U A133912 -1,1,1,-2,1,-1,1,1,-2,1,1,1,-3,1,-1,1,1,-2,1,1,1,-3,1,1,1,1,-4,1,-1,1,1,-2,1,-1,1,1,-2,1,1,1,-3,1,-1,1,1,-2,1 %N A133912 First differences of A007001. %e A133912 a(5) = 1 = A007001(5) - A007001(4) = (3 - 2). %Y A133912 Cf. A007001, A133913, A133914. %K A133912 sign %O A133912 1,6 %A A133912 _Gary W. Adamson_, Sep 28 2007 %E A133912 More terms from _Colin Barker_, Apr 19 2015