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 A252781 #18 Jan 25 2022 21:13:26 %S A252781 1,2,3,4,5,6,7,8,9,49,10,12,16,18,24,28,34,40,42,96,11,15,23,27,39,47, %T A252781 60,74,79,115,13,20,30,32,53,57,64,83,106,126,14,21,37,45,72,91,98, %U A252781 118,123,190,17,31,51,56,88,93,108,138,162,214,19,33,52,66 %N A252781 Inverse permutation to A106001. %H A252781 Reinhard Zumkeller, <a href="/A252781/b252781.txt">Table of n, a(n) for n = 1..10000</a> %Y A252781 Cf. A106001. %K A252781 nonn %O A252781 1,2 %A A252781 _Reinhard Zumkeller_, Jan 16 2015