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 A065264 #6 May 01 2014 02:42:45 %S A065264 2,4,1,8,10,5,3,16,18,20,22,11,6,9,7,32,34,36,38,40,42,44,46,23,12,21, %T A065264 13,19,14,17,15,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,47,24, %U A065264 45,25,43,26,41,27,39,28,37,29,35,30,33,31,128,130,132,134,136,138,140 %N A065264 Inverse permutation to A065263. %H A065264 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %K A065264 nonn %O A065264 1,1 %A A065264 _Antti Karttunen_, Oct 28 2001