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 A257815 #13 Jun 25 2015 17:16:56 %S A257815 1,2,3,4,5,6,9,7,8,10,24,11,37,15,12,13,82,14,118,16,19,38,232,17,20, %T A257815 56,18,25,574,21,759,22,46,119,30,23,1663,167,68,26,2700,31,3408,57, %U A257815 27,318,5338,28,47,32,141,83,10078,29,69,39,197,760,18312,33,22180 %N A257815 Inverse permutation of A064364, when seen as flattened list. %H A257815 Alois P. Heinz, <a href="/A257815/b257815.txt">Table of n, a(n) for n = 1..10000</a> %H A257815 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A257815 (Haskell) %o A257815 import Data.List (elemIndex); import Data.Maybe (fromJust) %o A257815 a257815 = (+ 1) . fromJust . (`elemIndex` a064364_list) %Y A257815 Cf. A064364. %K A257815 nonn %O A257815 1,2 %A A257815 _Reinhard Zumkeller_, Jun 11 2015 %E A257815 More terms from _Alois P. Heinz_, Jun 25 2015