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 A166277 #11 Mar 19 2022 00:23:52 %S A166277 1,2,3,4,5,7,6,8,9,12,10,19,13,20,11,14,15,21,16,30,22,31,17,45,32,46, %T A166277 23,67,33,47,18,24,25,34,26,48,35,49,27,68,50,69,36,97,51,70,28,98,71, %U A166277 99,52,139,72,100,37,195,101,140,53,196,73,102,29,38,39,54,40,74,55 %N A166277 Inverse permutation to A161919. %H A166277 Alois P. Heinz, <a href="/A166277/b166277.txt">Table of n, a(n) for n = 1..14271</a> %H A166277 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A166277 Inverse: A161919. %Y A166277 Cf. A166276. %K A166277 nonn,look %O A166277 1,2 %A A166277 _Antti Karttunen_, Oct 12 2009