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 A151931 #4 Mar 30 2012 16:51:07 %S A151931 1,1,1,0,2,-2,2,1,2,-3,1,2,0,0,3,0,2,-4,2,0,2,1,2,-2,0,-1,0,4,5,-2,-4, %T A151931 1,7,-5,-5,5,6,-7,2,5,-1,-5,5,7,-4,-1,-2,-2,10,-1,-3,-4,5,5,-4,1,6,-3, %U A151931 0,2,-1,-1,1,1,7,-3,-4,2,-1,2,1,4,0,-2,3,3,-5,4,-11,1,9,0,-1,-4,1,5,0,10,-7,2,1,-1,2,-1,-2,1,10,-5,-5,-1,1 %N A151931 First differences of A071049. %C A151931 Net increase in number of ON cells at generation n of 1-D CA using Rule 110. %H A151931 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a> %K A151931 sign %O A151931 0,5 %A A151931 _N. J. A. Sloane_, Aug 10 2009; corrected Oct 25 2009