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 A030776 #8 Feb 12 2021 19:42:20 %S A030776 5,10,19,20,36,48,50,61,76,77,116,136,156,158,181,184,210,242,249,252, %T A030776 281,285,293,296,318,326,359,405,413,415,454,459,463,476,505,507,512, %U A030776 515,560,566,622,680,687,743,752,813,817,823 %N A030776 Numbers k such that A030767(k) = 4. %Y A030776 Cf. A030767. %K A030776 nonn %O A030776 1,1 %A A030776 _Clark Kimberling_