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 A030785 #8 Feb 12 2021 20:08:32 %S A030785 1,5,7,17,46,47,48,133,155,210,233,239,242,251,268,306,309,315,316, %T A030785 319,347,350,355,357,391,394,437,440,486,489,493,538,541,596,599,607, %U A030785 618,657,660,666,668,674,720,723,787,790,859,862 %N A030785 Numbers k such that A030777(k) = 3. %Y A030785 Cf. A030777. %K A030785 nonn %O A030785 1,2 %A A030785 _Clark Kimberling_