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 A084498 #9 Jul 29 2017 12:43:41 %S A084498 1,3,2,6,4,5,8,9,7,12,11,10,16,13,14,15,20,17,19,18,22,24,21,23,28,26, %T A084498 25,27,31,32,29,30,36,35,33,34,38,39,40,37,42,44,43,41,47,46,48,45,52, %U A084498 50,51,49,55,56,54,53,60,59,58,57,64,61,65,62,63,68,66,70,69,67,74,71 %N A084498 Inverse permutation to A084497. %H A084498 A. Karttunen, <a href="/A084507/a084507.scm.txt">Scheme-program for computing this sequence</a> %H A084498 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A084498 Used to compute A084499. %K A084498 nonn %O A084498 1,2 %A A084498 _Antti Karttunen_, Jun 02 2003