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 A187099 #11 Mar 20 2022 21:42:40 %S A187099 1,2,3,4,5,6,7,9,8,11,10,14,12,13,15,18,16,17,19,21,20,25,22,23,24,27, %T A187099 26,30,28,29,31,33,32,40,34,35,39,37,36,41,44,38,42,45,43,48,50,46,47, %U A187099 51,49,55,52,57,56,53,54,59,61,58,65,63,60,84,62,64,67,69,68,66,70,71,72,74,73,77,75,76,82,79 %N A187099 Inverse permutation to A187098. %H A187099 Reinhard Zumkeller, <a href="/A187099/b187099.txt">Table of n, a(n) for n = 1..10000</a> %H A187099 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A187099 (Haskell) %o A187099 import Data.List (elemIndex); import Data.Maybe (fromJust) %o A187099 a187099 = (+ 1) . fromJust . (`elemIndex`a187098_list) %o A187099 -- _Reinhard Zumkeller_, Aug 04 2015 %Y A187099 Cf. A187098. %K A187099 nonn %O A187099 1,2 %A A187099 _Reinhard Zumkeller_, Mar 04 2011