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 A169856 #6 Jun 04 2022 21:52:06 %S A169856 2,5,3,8,4,12,10,6,9,18,1,22,11,7,15,31,14,35,16,13,17,41,20,26,21,24, %T A169856 28,56,25,60,29,19,30,27,33,66,34,23,38,73,37,80,39,43,40,88,44,49,45, %U A169856 32,46,99,47,52,48,36,55,106,51,114,59,50,63,53,58,127,64,42,54,133,62,137,65 %N A169856 a(n) = position of n in A169855. %C A169856 A generalization of A064421. %K A169856 nonn %O A169856 2,1 %A A169856 _T. D. Noe_ and _N. J. A. Sloane_, Jun 02 2010