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 A072062 #5 Mar 30 2012 18:57:04 %S A072062 1,2,3,5,4,7,6,9,11,8,13,15,10,17,12,19,21,14,23,16,25,27,18,29,31,20, %T A072062 33,22,35,37,24,39,41,26,43,28,45,47,30,49,32,51,53,34,55,57,36,59,38, %U A072062 61,63,40,65,42,67,69,44,71,73,46,75,48,77,79,50,81,83,52,85,54,87,89 %N A072062 Inverse permutation to A072061. %H A072062 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A072062 Cf. A072061. %K A072062 nonn %O A072062 1,2 %A A072062 _Clark Kimberling_, Jun 12 2002