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 A257111 #12 Apr 24 2015 06:32:19 %S A257111 1,1,2,-1,3,-1,5,-2,4,4,2,-11,15,6,-8,4,6,6,4,-6,8,4,-37,39,-37,41, %T A257111 -39,1,44,-32,28,-16,-23,45,-39,29,16,-49,47,-41,47,-45,7,-1,25,16,6, %U A257111 4,-6,8,4,8,4,-73,67,-61,57,-53,65,4,-62,64,4,-93,101,-6,4 %N A257111 First differences of A257339. %C A257111 a(n) = A257339(n+1) - A257339(n). %H A257111 Reinhard Zumkeller, <a href="/A257111/b257111.txt">Table of n, a(n) for n = 1..10000</a> %o A257111 (Haskell) %o A257111 a257111 n = a257111_list !! (n-1) %o A257111 a257111_list = zipWith (-) (tail a257339_list) a257339_list %Y A257111 Cf. A257339. %K A257111 sign %O A257111 1,3 %A A257111 _Reinhard Zumkeller_, Apr 24 2015