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 A179212 #2 Mar 30 2012 18:51:06 %S A179212 0,1,0,1,0,1,0,1,1,1,0,1,-1,1,0,2,0,2,0,2,0,0,0,0,1,0,1,2,0,1,-1,2,0, %T A179212 1,0,2,-1,1,0,1,0,1,0,1,1,1,0,1,0,2,0,2,0,2,0,2,0,0,0,1,0,-1,1,2,0,1, %U A179212 -1,2,0,1,0,2,-1,0,1,1,0,1,0,1,1,1,0,1,-1,1,-1,2,0,2,0,2,0,0,0,2,0,1,1,2,0,1 %N A179212 First differences of A179211. %C A179212 a(n) = A179211(n+1) - A179211(n); %C A179212 -1 <= a(n) <= 2. %F A179212 a(n) = A008966(2*n+2) + A008966(2*n+1) - A008966(n). %K A179212 sign %O A179212 1,16 %A A179212 _Reinhard Zumkeller_, Jul 05 2010