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 A237347 #4 Mar 18 2014 17:58:17 %S A237347 3,3,2,3,2,3,2,2,3,2,2,3,2,2,2,3,2,2,2,3,2,2,2,2,3,2,2,2,2,3,2,2,2,2, %T A237347 2,3,2,2,2,2,2,3,2,2,2,2,2,2,3,2,2,2,2,2,2,3,2,2,2,2,2,2,2,3,2,2,2,2, %U A237347 2,2,2,3,2,2,2,2,2,2,2,2,3,2,2,2,2,2 %N A237347 First differences of A078633. %C A237347 a(n) = A078633(n+1) - A078633(n); %C A237347 2 <= a(n) <= 3; %C A237347 a(A049068(n)) = 2; a(A002620(n)) = 3; %C A237347 A237347(n) = abs(A167752(n)) + 2. %H A237347 Reinhard Zumkeller, <a href="/A237347/b237347.txt">Table of n, a(n) for n = 1..10000</a> %o A237347 (Haskell) %o A237347 a237347 n = a237347_list !! (n-1) %o A237347 a237347_list = zipWith (-) (tail a078633_list) a078633_list %K A237347 nonn %O A237347 1,1 %A A237347 _Reinhard Zumkeller_, Mar 18 2014