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 A064786 #7 May 10 2013 12:44:53 %S A064786 2,1,4,6,3,8,5,10,12,7,14,16,9,18,11,20,22,13,24,15,26,28,17,30,32,19, %T A064786 34,21,36,38,23,40,42,25,44,27,46,48,29,50,31,52,54,33,56,58,35,60,37, %U A064786 62,64,39,66,41,68,70,43,72,74,45,76,47,78,80,49,82,84,51,86,53,88,90 %N A064786 Inverse permutation to A054084. %H A064786 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %K A064786 easy,nonn %O A064786 1,1 %A A064786 _N. J. A. Sloane_, Oct 20 2001 %E A064786 More terms from _Vladeta Jovovic_, Oct 22 2001