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 A256371 #7 Mar 22 2022 10:01:29 %S A256371 2,1,3,5,4,6,7,11,8,12,9,14,10,15,13,17,16,19,18,22,20,23,21,28,24,29, %T A256371 25,30,26,32,27,34,31,36,33,38,35,40,37,41,39,45,42,46,43,48,44,49,47, %U A256371 51,50,53,52,57,54,58,55,59,56,62,60,64,61,66,63,68,65 %N A256371 Inverse permutation to A256210. %H A256371 Reinhard Zumkeller, <a href="/A256371/b256371.txt">Table of n, a(n) for n = 1..10000</a> %H A256371 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A256371 (Haskell) %o A256371 import Data.List (elemIndex); import Data.Maybe (fromJust) %o A256371 a256371 = (+ 1) . fromJust . (`elemIndex` a256210_list) %Y A256371 Cf. A256210 (inverse), A256372 (fixed points). %K A256371 nonn %O A256371 1,1 %A A256371 _Reinhard Zumkeller_, Mar 26 2015