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 A100280 #10 Sep 06 2017 21:25:33 %S A100280 0,1,3,2,6,7,5,4,13,12,14,15,11,10,8,9,27,26,24,25,29,28,30,31,22,23, %T A100280 21,20,16,17,19,18,54,55,53,52,48,49,51,50,59,58,56,57,61,60,62,63,45, %U A100280 44,46,47,43,42,40,41,32,33,35,34,38,39,37,36,109,108,110,111,107,106,104 %N A100280 Inverse permutation to A099896. %C A100280 A100282(n) = a(a(n)). %H A100280 Ivan Neretin, <a href="/A100280/b100280.txt">Table of n, a(n) for n = 0..8191</a> %H A100280 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A100280 Cf. A006068, A003188. %K A100280 nonn,look %O A100280 0,3 %A A100280 _Reinhard Zumkeller_, Nov 11 2004