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 A084492 #9 Jul 29 2017 12:41:05 %S A084492 1,3,9,5,11,7,13,2,17,4,15,6,19,10,21,8,23,12,25,14,29,16,27,18,33,22, %T A084492 31,20,35,26,39,24,41,28,37,34,47,30,43,32,45,38,53,40,51,36,49,46,55, %U A084492 44,57,42,59,48,61,50,63,52,65,54,69,56,67,58,71,62,75,60,73,64,77,68 %N A084492 Inverse permutation to A084491. %H A084492 A. Karttunen, <a href="/A084507/a084507.scm.txt">Scheme-program for computing this sequence</a> %H A084492 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %K A084492 nonn %O A084492 1,2 %A A084492 _Antti Karttunen_, Jun 02 2003