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 A163238 #7 Mar 18 2022 21:52:55 %S A163238 0,1,4,2,6,3,7,11,24,18,12,17,9,13,8,5,28,21,29,37,10,15,22,16,31,39, %T A163238 30,23,58,48,38,47,112,98,84,97,73,85,72,61,40,49,60,50,70,59,71,83, %U A163238 35,43,34,27,62,52,42,51,32,25,33,41,14,19,26,20,120,105,121,137,78 %N A163238 Inverse permutation to A163237. %H A163238 A. Karttunen, <a href="/A163238/b163238.txt">Table of n, a(n) for n = 0..4095</a> %H A163238 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A163238 Inverse: A163237. a(n) = A163234(A163241(n)). Cf. A163240. %K A163238 nonn %O A163238 0,3 %A A163238 _Antti Karttunen_, Jul 29 2009