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 A101545 #12 Feb 08 2016 09:13:03 %S A101545 1,2,3,4,5,7,8,10,6,11,13,14,9,16,17,19,20,12,22,23,25,26,15,28,29,31, %T A101545 32,34,18,35,37,38,21,40,41,43,44,46,24,47,49,50,27,52,53,55,56,58,30, %U A101545 59,61,62,33,64,65,67,68,36,70,71,73,74,39,76,77,79,80,82,42,83,85,86 %N A101545 Inverse permutation to A101544. %C A101545 A101547(n) = a(a(n)). %H A101545 Ivan Neretin, <a href="/A101545/b101545.txt">Table of n, a(n) for n = 1..10000</a> %H A101545 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A101545 Cf. A101544, A101547. %K A101545 nonn %O A101545 1,2 %A A101545 _Reinhard Zumkeller_, Dec 06 2004