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 A050417 #8 Aug 16 2021 03:04:11 %S A050417 1,3,4,8,5,57,11,6,13,48,66,15,7,81,54,17,9,69,61,56,10,36,45,71,63, %T A050417 58,20,12,38,47,91,59,160,65,251,22,14,130,40,49,93,85,80,162,67,53, %U A050417 253,24,16,33,132,42,116,223,95,68,82,60,164 %N A050417 Least k such that A050416(k) = n. %Y A050417 Cf. A050416. %K A050417 nonn %O A050417 1,2 %A A050417 _Clark Kimberling_ %E A050417 a(50) corrected by _Sean A. Irvine_, Aug 15 2021