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 A030716 #10 Feb 12 2021 18:10:53 %S A030716 4,23,33,34,41,59,76,89,90,115,134,162,167,194,197,230,261,263,267, %T A030716 294,305,341,344,348,350,378,436,437,444,483,543,545,550,610,648,656, %U A030716 664,669,677,727,736,738,743,792,809,816,818,883 %N A030716 Numbers k such that A030707(k) = 4. %Y A030716 Cf. A030707. %K A030716 nonn %O A030716 1,1 %A A030716 _Clark Kimberling_