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 A030744 #8 Feb 12 2021 20:46:15 %S A030744 1,4,13,20,28,29,39,40,52,53,67,68,85,86,105,106,127,128,151,206,223, %T A030744 226,229,236,238,273,303,311,343,350,353,389,391,393,395,399,427,444, %U A030744 448,492,497,501,541,543,550,554,556,613,673 %N A030744 Numbers k such that A030737(k) = 2. %Y A030744 Cf. A030737. %K A030744 nonn %O A030744 1,2 %A A030744 _Clark Kimberling_