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 A261334 #4 Aug 15 2015 12:11:00 %S A261334 10,0,1,2,3,4,5,6,7,8,30,9,14,16,18,20,22,24,26,28,50,11,29,36,38,40, %T A261334 42,44,46,48,70,12,31,49,58,60,62,64,66,68,90,13,33,51,69,80,82,84,86, %U A261334 88,110,15,34,53,71,89,102,104,106,108,130,17,35,55,73,91 %N A261334 Inverse permutation to A261333. %H A261334 Reinhard Zumkeller, <a href="/A261334/b261334.txt">Table of n, a(n) for n = 0..10000</a> %H A261334 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A261334 (Haskell) %o A261334 import Data.List (elemIndex); import Data.Maybe (fromJust) %o A261334 a261334 = fromJust . (`elemIndex` a261333_list) %Y A261334 Cf. A261333 (inverse), A261335 (fixed points), A065650. %K A261334 nonn,look %O A261334 0,1 %A A261334 _Reinhard Zumkeller_, Aug 15 2015