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 A258263 #8 Jun 05 2015 03:15:17 %S A258263 1,0,2,3,1,4,4,1,9,5,2,10,-2,4,8,11,8,5,11,-5,15,5,11,14,10,-1,7,11,0, %T A258263 32,14,4,11,19,15,2,11,10,12,25,15,21,-11,15,10,47,8,17,16,-6,48,-2, %U A258263 24,-3,24,28,8,10,41,-27,33,49,25,-11,15,73,1,31,23,-8,42,13,13,67,-23,56,5,30,33,41,14,49,-34,42,-6,64,13,21 %N A258263 First differences of A258233. %H A258263 Zak Seidov, <a href="/A258263/b258263.txt">Table of n, a(n) for n = 1..1000</a> %F A258263 a(n) = A258233(n+1)-A258233(n). %Y A258263 Cf. A258233. %K A258263 sign %O A258263 1,3 %A A258263 _Zak Seidov_, May 24 2015