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 A084530 #9 Jul 29 2017 12:39:28 %S A084530 1,3,9,5,13,7,11,2,17,6,19,4,15,12,25,8,21,10,23,16,31,18,29,14,27,24, %T A084530 35,22,37,20,39,32,33,26,43,28,47,30,45,40,41,34,53,38,49,36,55,44,51, %U A084530 48,61,42,59,46,63,56,57,52,69,50,71,54,65,62,67,64,77,58,79,60,75,72 %N A084530 Inverse permutation to A084499. %H A084530 A. Karttunen, <a href="/A084507/a084507.scm.txt">Scheme-program for computing this sequence</a> %H A084530 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %K A084530 nonn %O A084530 1,2 %A A084530 _Antti Karttunen_, Jun 02 2003