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 A102571 #9 May 03 2023 05:56:41 %S A102571 1,2,3,4,5,6,9,11,14,7,16,8,18,10,20,12,22,13,24,15,26,27,30,32,33,34, %T A102571 37,19,39,40,21,43,46,47,50,23,52,25,54,56,57,58,31,29,61,62,65,17,67, %U A102571 68,35,36,71,72,38,75,78,41,80,42,82,83,86,44,88,45,90,49,92,48,94,96 %N A102571 a(n) = A102569(A102569(n)). %C A102571 Inverse permutation to A102570. %H A102571 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A102571 Cf. A102568, A102569. %K A102571 nonn %O A102571 1,2 %A A102571 _Reinhard Zumkeller_, Jan 15 2005