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 A169854 #6 Jun 04 2022 21:52:16 %S A169854 3,6,4,11,5,15,9,7,10,1,8,23,14,12,18,31,13,37,19,16,2,43,17,20,22,25, %T A169854 28,56,21,60,29,26,30,34,27,66,36,24,35,73,33,80,41,39,42,88,40,49,46, %U A169854 32,47,99,45,52,48,38,55,106,51,114,59,50,63,53,58,127,64,44,54,133,62,137,65 %N A169854 a(n) = position of n in A169853. %C A169854 A generalization of A064421. %K A169854 nonn %O A169854 2,1 %A A169854 _T. D. Noe_ and _N. J. A. Sloane_, Jun 02 2010