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 A030770 #6 Sep 04 2022 21:45:29 %S A030770 2,1,6,5,9,14,15,21,22,30,68,31,41,229,42,54,170,55,69,173,70,87,174, %T A030770 88,107,175,348,108,205,237,130,272,176,153,309,177,310,207,444,351, %U A030770 445,273,397,311,239,732,353,274,499,669,399,312 %N A030770 a(n) = least k such that s(k) = n, where s = A030767. %Y A030770 Cf. A030767. %K A030770 nonn %O A030770 1,1 %A A030770 _Clark Kimberling_