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 A264893 #6 Nov 28 2015 03:04:51 %S A264893 1,0,1,0,1,-1,2,-1,0,0,1,-1,2,-1,1,0,1,-2,3,-2,2,-2,3,-2,0,0,3,-3,4, %T A264893 -4,5,-4,4,-4,5,-2,3,-5,5,-5,6,-6,7,-6,5,-5,6,-6,1,0,6,-6,7,-7,7,-7,8, %U A264893 -7,8,-9,10,-8,7,0,2,-9,10,-9,9,-9,10,-12,13,-10 %N A264893 First differences of A155043. %C A264893 a(n) = A155043(n+1) - A155043(n); %C A264893 a(A264898(n)) = 0; %C A264893 it is not true that in general a(even) >= 0 and a(odd) <= 0: %C A264893 even indices with negative values: 224,226,1088,1090,1368,1520,1860, ... %C A264893 odd indices with positive values: 225,441,445,675,1023,1035,1089,1093, ... . %H A264893 Reinhard Zumkeller, <a href="/A264893/b264893.txt">Table of n, a(n) for n = 0..10000</a> %o A264893 (Haskell) %o A264893 a264893 n = a264893_list !! n %o A264893 a264893_list = zipWith (-) (tail a155043_list) a155043_list %Y A264893 Cf. A155043, A264898. %K A264893 sign,look %O A264893 0,7 %A A264893 _Reinhard Zumkeller_, Nov 27 2015