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 A120002 #6 Mar 30 2012 18:50:54 %S A120002 0,0,0,0,0,0,0,0,0,1,0,6,-2,-1,0,-1,0,0,0,-2,10,-10,3,3,-4,2,-3,2,-2, %T A120002 -1,10,-5,-5,2,0,4,-5,0,3,-4,10,0,-7,-3,2,1,-2,5,-5,-1,10,-5,-2,-1,-2, %U A120002 1,0,0,0,-1,10,0,0,-5,-3,-2,1,1,1,-3,10,-5,-2,-1,0,-1,-1,1,0,-1,10,0,-7,7,-8,1,-2,-1,1,-1,10,-5,5,-8,0,3,-4 %N A120002 First differences of A119999. %C A120002 a(n) = A119999(n+1) - A119999(n). %Y A120002 Cf. A120003. %K A120002 sign %O A120002 0,12 %A A120002 _Reinhard Zumkeller_, Jun 13 2006 %E A120002 Corrected by _N. J. A. Sloane_, Oct 01 2006