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 A094512 #9 Nov 30 2014 03:30:15 %S A094512 2,1,5,3,6,7,11,4,10,9,13,14,15,19,23,8,12,17,21,18,22,25,27,20,26,28, %T A094512 29,30,31,39,47,16,24,33,37,34,35,41,43,36,38,44,45,42,46,51,55,40,50, %U A094512 49,53,54,57,58,59,52,60,61,62,63,79,87,95,32,48,56,69,65,67,71,75,66 %N A094512 Inverse of A094511. %C A094512 Permutation of the natural numbers: A094511(a(n))=a(A094511(n))=n. %H A094512 Reinhard Zumkeller, <a href="/A094512/b094512.txt">Table of n, a(n) for n = 1..10000</a> %H A094512 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A094512 (Haskell) %o A094512 import Data.List (elemIndex); import Data.Maybe (fromJust) %o A094512 a094512 = (+ 1) . fromJust . (`elemIndex` a094511_list) %o A094512 -- _Reinhard Zumkeller_, Nov 23 2014 %Y A094512 Cf. A007088, A000120, A094514. %K A094512 nonn %O A094512 1,1 %A A094512 _Reinhard Zumkeller_, May 06 2004