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 A214546 #6 Jul 13 2013 12:04:29 %S A214546 1,1,0,2,-1,1,0,4,-3,1,0,2,-1,1,0,8,-7,1,0,2,-1,1,0,4,-3,1,0,2,-1,1,0, %T A214546 16,-15,1,0,2,-1,1,0,4,-3,1,0,2,-1,1,0,8,-7,1,0,2,-1,1,0,4,-3,1,0,2, %U A214546 -1,1,0,32,-31,1,0,2,-1,1,0,4,-3,1,0,2,-1,1,0 %N A214546 First differences of A140472. %C A214546 a(n) = A140472(n+1) - A140472(n); %C A214546 a(A016825(n)) = 0; a(A042965(n)) <> 0; %C A214546 for n > 0: a(A008586(n)) < 0, a(A005843(n)) <= 0, a(A042968(n)) >= 0; %C A214546 a(A004273(n)) > 0. %H A214546 Reinhard Zumkeller, <a href="/A214546/b214546.txt">Table of n, a(n) for n = 0..10000</a> %o A214546 (Haskell) %o A214546 a214546 n = a214546_list !! n %o A214546 a214546_list = zipWith (-) (tail a140472_list) a140472_list %Y A214546 Cf. A093879. %K A214546 sign %O A214546 0,4 %A A214546 _Reinhard Zumkeller_, Jul 20 2012