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 A193926 #8 Jul 13 2013 12:04:14 %S A193926 0,1,2,-3,1,2,1,2,5,-9,4,5,12,-13,7,-15,4,5,12,-19,2,5,12,-23,1,2,1,2, %T A193926 5,12,1,2,5,27,-34,2,5,27,-38,7,7,25,-42,12,24,-45,12,7,7,25,-50,3,24, %U A193926 32,-54,18,32,-57,7,18,32,-61,1,2,5,12,1,2,5,27,15 %N A193926 First differences of A062039. %C A193926 a(n) = A062039(n+1) - A062039(n); %C A193926 a(A193927(n)) = - A193927(n). %H A193926 Reinhard Zumkeller, <a href="/A193926/b193926.txt">Table of n, a(n) for n = 0..10000</a> %o A193926 (Haskell) %o A193926 a193926 n = a193926_list !! n %o A193926 a193926_list = zipWith (-) (tail a062039_list) a062039_list %K A193926 sign %O A193926 0,3 %A A193926 _Reinhard Zumkeller_, Aug 10 2011