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 A252023 #11 Mar 22 2022 00:11:26 %S A252023 1,2,3,4,5,7,9,15,21,6,8,10,11,12,13,17,19,23,41,14,16,18,25,26,27,29, %T A252023 34,43,50,20,24,28,30,31,32,36,45,53,58,22,33,35,37,38,39,47,56,60,90, %U A252023 40,44,46,48,62,64,74,80,92,105,42,54,66,68,76,78,82,94 %N A252023 Inverse permutation to A252022. %H A252023 Reinhard Zumkeller, <a href="/A252023/b252023.txt">Table of n, a(n) for n = 1..10000</a> %H A252023 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A252023 (Haskell) %o A252023 import Data.List (elemIndex); import Data.Maybe (fromJust) %o A252023 a252023 = (+ 1) . fromJust . (`elemIndex` a252022_list) %Y A252023 Cf. A252022 (inverse), A252079 (fixed points). %K A252023 nonn,look %O A252023 1,2 %A A252023 _Reinhard Zumkeller_, Dec 12 2014