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 A261789 #4 Feb 15 2016 12:20:41 %S A261789 2,2,3,1,2,4,3,1,3,3,3,2,2,4,2,5,3,3,3,3,3,3,3,4,3,3,1,4,3,2,2,4,2,4, %T A261789 4,4,4,2,5,5,2,3,3,3,3,3,3,3,3,4,3,3,4,3,3,3,3,4,3,3,1,4,3,4,4,5,3,3, %U A261789 3,3,3,1,4,3,4,3,3,1,4,3,2,2,4,2,4,4 %N A261789 First differences of A261786. %C A261789 a(n) = A261787(A261786(n)). %H A261789 Reinhard Zumkeller, <a href="/A261789/b261789.txt">Table of n, a(n) for n = 1..10000</a> %o A261789 (Haskell) %o A261789 a261789 n = a261789_list !! (n-1) %o A261789 a261789_list = zipWith (-) (tail a261786_list') a261786_list' %Y A261789 Cf. A261645, A261461, A261786, A261018, A261795. %K A261789 nonn %O A261789 1,1 %A A261789 _Reinhard Zumkeller_, Sep 01 2015