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 A255878 #4 Mar 26 2015 11:39:01 %S A255878 1,-1,1,2,1,-4,1,1,4,1,1,-8,1,1,1,7,1,1,1,-13,1,1,1,1,11,1,1,1,1,-19, %T A255878 1,1,1,1,1,16,1,1,1,1,1,-26,1,1,1,1,1,1,22,1,1,1,1,1,1,-34,1,1,1,1,1, %U A255878 1,1,29,1,1,1,1,1,1,1,-43,1,1,1,1,1,1,1,1 %N A255878 First differences of A256188. %H A255878 Reinhard Zumkeller, <a href="/A255878/b255878.txt">Table of n, a(n) for n = 1..10000</a> %o A255878 (Haskell) %o A255878 a255878 n = a255878_list !! (n-1) %o A255878 a255878_list = zipWith (-) (tail a256188_list) a256188_list %Y A255878 Cf. A256188, A255437. %K A255878 sign %O A255878 1,4 %A A255878 _Reinhard Zumkeller_, Mar 26 2015