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 A030736 #10 Jul 04 2021 13:31:22 %S A030736 12,27,28,38,63,65,67,81,84,100,104,121,124,146,164,170,190,197,227, %T A030736 251,278,287,290,297,338,371,372,378,382,418,420,428,470,473,477,529, %U A030736 578,583,587,648,700,711,755,759,766,768,778,846 %N A030736 Numbers k such that A030727(k) = 4. %Y A030736 Cf. A030727. %K A030736 nonn %O A030736 1,1 %A A030736 _Clark Kimberling_