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 A258226 #4 May 27 2015 05:52:50 %S A258226 3,6,9,2,5,8,1,4,7,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78, %T A258226 81,84,87,90,93,96,99,102,105,108,11,14,17,20,23,26,29,32,35,38,41,44, %U A258226 47,50,53,56,59,62,65,68,71,74,77,80,83,86,89,92,95,98 %N A258226 Inverse permutation to A258225. %H A258226 Reinhard Zumkeller, <a href="/A258226/b258226.txt">Table of n, a(n) for n = 1..9999</a> %H A258226 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A258226 (Haskell) %o A258226 import Data.List (elemIndex); import Data.Maybe (fromJust) %o A258226 a258226 = (+ 1) . fromJust . (`elemIndex` a258225_list) %Y A258226 Cf. A258225. %K A258226 nonn %O A258226 1,1 %A A258226 _Reinhard Zumkeller_, May 27 2015