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 A030765 #8 Feb 12 2021 20:08:50 %S A030765 3,11,16,18,22,32,39,51,66,71,72,74,83,87,101,107,123,147,150,152,157, %T A030765 174,204,208,210,216,238,255,274,278,280,281,355,361,362,406,415,449, %U A030765 454,455,502,558,565,566,585,620,625,627,636 %N A030765 Numbers k such that A030757(k) = 3. %Y A030765 Cf. A030757. %K A030765 nonn %O A030765 1,1 %A A030765 _Clark Kimberling_