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 A050089 #8 Aug 06 2021 07:32:07 %S A050089 1,3,13,5,10,2,28,7,33,12,88,4,122,30,114,9,106,14,77,119,27,90,132,6, %T A050089 82,124,145,32,95,11,279,24,87,108,271,16,58,79,192,121,213,29,71,92, %U A050089 113,134,347,8,63,84,105,126,339,34,289,55,76,97,189,118,139,281,423,26 %N A050089 a(n) = position of n in A050088. %Y A050089 Cf. A050088. %K A050089 nonn %O A050089 1,2 %A A050089 _Clark Kimberling_ %E A050089 a(41)=213 inserted by _Georg Fischer_, Aug 06 2021