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 A258335 #8 May 27 2015 05:56:59 %S A258335 7,1,2,28,3,4,49,5,6,70,77,8,9,98,10,11,119,12,13,14,147,15,16,168,17, %T A258335 18,189,19,20,21,217,22,23,238,24,25,259,26,27,280,287,29,30,308,31, %U A258335 32,329,33,34,35,357,36,37,378,38,39,399,40,41,42,427,43,44 %N A258335 Inverse permutation to A258334. %H A258335 Reinhard Zumkeller, <a href="/A258335/b258335.txt">Table of n, a(n) for n = 1..9999</a> %H A258335 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A258335 (Haskell) %o A258335 import Data.List (elemIndex); import Data.Maybe (fromJust) %o A258335 a258335 = (+ 1) . fromJust . (`elemIndex` a258334_list) %Y A258335 Cf. A258334. %K A258335 nonn %O A258335 1,1 %A A258335 _Reinhard Zumkeller_, May 27 2015