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 A255507 #6 Mar 26 2015 11:36:16 %S A255507 1,1,-2,2,2,1,1,1,-7,2,2,5,1,1,1,1,1,-14,2,2,2,10,1,1,1,1,1,1,1,-23,2, %T A255507 2,2,2,17,1,1,1,1,1,1,1,1,1,-34,2,2,2,2,2,26,1,1,1,1,1,1,1,1,1,1,1, %U A255507 -47,2,2,2,2,2,2,37,1,1,1,1,1,1,1,1,1,1,1,1 %N A255507 First differences of A255437. %H A255507 Reinhard Zumkeller, <a href="/A255507/b255507.txt">Table of n, a(n) for n = 1..10000</a> %o A255507 (Haskell) %o A255507 a255507 n = a255507_list !! (n-1) %o A255507 a255507_list = zipWith (-) (tail a255437_list) a255437_list %Y A255507 Cf. A255437, A255878. %K A255507 sign %O A255507 1,3 %A A255507 _Reinhard Zumkeller_, Mar 23 2015