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 A166015 #7 Mar 20 2022 21:42:29 %S A166015 1,2,3,5,8,4,6,9,13,7,10,14,21,11,15,22,12,16,23,34,17,24,35,18,25,36, %T A166015 19,26,37,20,27,38,55,28,39,56,29,40,57,30,41,58,31,42,59,32,43,60,33, %U A166015 44,61,89,45,62,90,46,63,91,47,64,92,48,65,93,49,66,94,50,67,95,51,68 %N A166015 Inverse permutation to A138608. %H A166015 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A166015 Inverse: A138608. %K A166015 nonn %O A166015 1,2 %A A166015 _Antti Karttunen_, Oct 05 2009