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 A030766 #13 Jan 12 2025 14:56:14 %S A030766 5,24,30,31,44,53,68,89,90,104,131,149,154,176,179,207,240,244,246, %T A030766 277,288,313,315,319,322,373,401,408,409,462,504,509,511,562,621,629, %U A030766 634,642,650,688,693,695,704,752,754,761,778,823 %N A030766 Numbers k such that A030757(k) = 4. %Y A030766 Cf. A030757, A030764, A030765. %K A030766 nonn %O A030766 1,1 %A A030766 _Clark Kimberling_