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 A227114 #4 Jul 01 2013 16:07:44 %S A227114 1,2,4,3,6,5,8,10,12,7,14,11,16,9,13,18,20,19,22,24,26,15,28,25,30,17, %T A227114 27,32,34,31,36,33,38,21,40,39,42,23,44,41,46,45,48,50,52,29,54,51,56, %U A227114 53,58,60,62,59,64,57,66,35,68,61,70,37,67,72,65,73,74 %N A227114 Inverse permutation to A227113. %H A227114 Reinhard Zumkeller, <a href="/A227114/b227114.txt">Table of n, a(n) for n = 1..10000</a> %H A227114 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A227114 (Haskell) %o A227114 import Data.List (elemIndex); import Data.Maybe (fromJust) %o A227114 a227114 = (+ 1) . fromJust . (`elemIndex` a227113_list) %K A227114 nonn %O A227114 1,2 %A A227114 _Reinhard Zumkeller_, Jul 01 2013