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 A255940 #4 Mar 12 2015 14:04:49 %S A255940 1,2,3,6,7,13,12,4,25,9,17,8,24,20,5,32,37,11,38,16,10,15,44,18,49,22, %T A255940 23,14,54,28,65,30,21,35,43,27,70,40,26,33,78,45,83,29,57,42,88,34,96, %U A255940 47,39,31,106,55,19,50,36,52,115,41,120,63,59,48,73,66 %N A255940 Inverse permutation to A249167. %H A255940 Reinhard Zumkeller, <a href="/A255940/b255940.txt">Table of n, a(n) for n = 1..10000</a> %H A255940 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A255940 (Haskell) %o A255940 import Data.List (elemIndex); import Data.Maybe (fromJust) %o A255940 a255940 = (+ 1) . fromJust . (`elemIndex` a249167_list) %Y A255940 Cf. A249167 (inverse), A098551, A255479. %K A255940 nonn %O A255940 1,2 %A A255940 _Reinhard Zumkeller_, Mar 12 2015