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 A084454 #9 Jul 29 2017 12:47:56 %S A084454 4,1,2,3,8,9,5,6,7,13,11,15,10,12,18,14,20,21,16,17,24,19,23,27,28,22, %T A084454 30,25,26,33,34,35,29,31,32,39,40,41,42,36,37,38,46,47,44,49,50,43,45, %U A084454 53,54,48,56,52,58,51,60,61,55,63,57,65,66,59,68,69,62,71,64,73,74,75 %N A084454 Inverse permutation to A084453. %H A084454 A. Karttunen, <a href="/A084507/a084507.scm.txt">Scheme-program for computing this sequence</a> %H A084454 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A084454 Used to compute A084455. %K A084454 nonn %O A084454 1,1 %A A084454 _Antti Karttunen_, Jun 02 2003