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 A050009 #7 Aug 06 2021 07:31:54 %S A050009 1,7,3,6,27,2,23,37,5,26,33,8,15,22,29,36,86,4,18,50,25,32,107,39,64, %T A050009 182,14,21,189,28,103,128,35,85,178,10,67,92,17,49,74,24,124,665,31, %U A050009 106,174,38,500,63,88,181,826,13,70,163,20,188,704,52,77,557,102 %N A050009 a(n) = position of n in A050008. %Y A050009 Cf. A050008. %K A050009 nonn,easy %O A050009 1,2 %A A050009 _Clark Kimberling_ %E A050009 a(44) onwards corrected by _Georg Fischer_, Aug 06 2021