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 A065578 #6 Mar 30 2012 17:37:51 %S A065578 1,2,3,5,4,7,11,6,9,8,13,10,17,19,14,12,15,23,16,29,21,18,22,20,25,31, %T A065578 26,27,37,24,41,28,33,34,32,30,35,43,38,39,47,53,36,46,49,40,44,42,45, %U A065578 59,51,61,50,55,52,48,57,58,67,54,71,56,62,65 %N A065578 Inverse permutation to A065561. %C A065578 Every positive integer occurs once and only once somewhere in this sequence. %H A065578 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %K A065578 nonn %O A065578 1,2 %A A065578 _N. J. A. Sloane_, Nov 29 2001 %E A065578 More terms from _John W. Layman_, Dec 11 2001