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 A109969 #6 Mar 30 2012 18:50:50 %S A109969 0,1,0,1,1,1,1,2,1,2,1,2,2,2,2,1,3,0,3,0,3,0,0,1,1,0,-1,1,-1,1,-3,2, %T A109969 -2,1,-2,0,0,-1,2,-2,1,-2,4,-2,2,-1,1,0,1,0,1,3,-4,7,-5,2,-1,2,2,1,-1, %U A109969 -1,2,-1,5,-3,4,-2,2,-1,1,0,2,4,-4,6,-3,2,-1,2,0,1,3,1,1,-4,8,-6,4,1,2,0,-1 %N A109969 First differences of A109968. %C A109969 a(n) = A109968(n+1) - A109968(n); %C A109969 Conjecture: a(n) is bounded. %Y A109969 Cf. A109967, A109951. %K A109969 sign,base %O A109969 1,8 %A A109969 _Reinhard Zumkeller_, Jul 06 2005