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 A113233 #17 Apr 26 2022 08:28:54 %S A113233 1,2,4,3,6,9,16,5,10,7,20,12,26,14,28,8,13,11,22,19,24,30,39,17,33,36, %T A113233 41,44,51,54,76,15,18,25,43,21,37,34,48,23,31,60,80,46,57,85,104,27, %U A113233 66,62,71,64,90,83,109,68,88,100,102,74,112,107,162,29,35,32,45,42,61,67 %N A113233 Inverse permutation to A109812. %H A113233 Reinhard Zumkeller, <a href="/A113233/b113233.txt">Table of n, a(n) for n = 1..10000</a> %H A113233 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A113233 A113234(n) = a(a(n)). %o A113233 (Haskell) %o A113233 import Data.List (elemIndex); import Data.Maybe (fromJust) %o A113233 a113233 = (+ 1) . fromJust . (`elemIndex` a109812_list) %o A113233 -- _Reinhard Zumkeller_, Sep 15 2014 %Y A113233 Cf. A109812, A113232, A113234, A305370. %K A113233 nonn,base %O A113233 1,2 %A A113233 _Reinhard Zumkeller_, Oct 19 2005 %E A113233 a(63) corrected by _Reinhard Zumkeller_, Sep 15 2014