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 A166017 #4 Mar 31 2012 13:21:19 %S A166017 1,2,4,3,7,11,5,16,22,29,8,6,37,46,12,56,67,79,9,17,92,106,23,121,137, %T A166017 13,30,10,154,172,191,211,38,232,18,254,47,277,14,301,326,24,57,352, %U A166017 379,68,407,436,31,80,466,19,15,497,529,562,93,596,631,39,107,667,704 %N A166017 Inverse permutation of A138612. %H A166017 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A166017 Inverse: A138612. %K A166017 nonn %O A166017 1,2 %A A166017 _Antti Karttunen_, Oct 05 2009