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 A214416 #10 Mar 22 2022 00:10:36 %S A214416 0,1,3,2,4,7,6,5,15,10,9,8,11,14,13,12,22,17,16,31,18,21,20,19,30,25, %T A214416 24,23,26,29,28,27,37,32,63,46,33,36,35,34,45,40,39,38,41,44,43,42,53, %U A214416 48,47,62,49,52,51,50,61,56,55,54,57,60,59,58,68,127,94 %N A214416 Inverse permutation to A105025. %H A214416 Reinhard Zumkeller, <a href="/A214416/b214416.txt">Table of n, a(n) for n = 0..10000</a> %H A214416 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A214416 (Haskell) %o A214416 import Data.List (elemIndex) %o A214416 import Data.Maybe (fromJust) %o A214416 a214416 = fromJust . (`elemIndex` a105025_list) %Y A214416 Cf. A214417, A105271 (fixed points). %K A214416 nonn %O A214416 0,3 %A A214416 _Reinhard Zumkeller_, Jul 21 2012