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 A064275 #18 Nov 22 2015 13:34:42 %S A064275 1,2,3,4,6,5,10,7,11,8,19,9,21,12,14,15,27,13,33,16,22,20,42,17,37,23, %T A064275 34,24,54,18,56,28,38,29,44,25,65,35,45,30,73,26,82,39,46,43,89,31,83, %U A064275 40,58,47,102,36,74,48,66,55,109,32,111,57,67,59,91,41,128,60,86,49,130,50,132,68,75,69,112,51,149,61 %N A064275 Inverse of sequence A032447 considered as a permutation of the positive integers. %H A064275 Alois P. Heinz, <a href="/A064275/b064275.txt">Table of n, a(n) for n = 1..20000</a> %H A064275 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A064275 (Haskell) %o A064275 import Data.List (elemIndex); import Data.Maybe (fromJust) %o A064275 a064275 = (+ 1) . fromJust . (`elemIndex` a032447_list) %o A064275 -- _Reinhard Zumkeller_, Nov 22 2015 %Y A064275 Cf. A032447, A007614. %K A064275 nonn,look,easy %O A064275 1,2 %A A064275 _Howard A. Landman_, Sep 23 2001 %E A064275 Edited by _N. J. A. Sloane_, Nov 05 2007 %E A064275 More terms from _Alois P. Heinz_, Jan 20 2011