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 A080321 #5 Jan 11 2024 10:54:41 %S A080321 0,4,428,58747,1758473969,340760636747,14410746502617904, %T A080321 673020037180959760871,1736622037158911219053381734718, %U A080321 400539731185759177060380684246324 %N A080321 a(n) = A080301(A080318(n)). %Y A080321 Cf. A080320. %K A080321 nonn %O A080321 0,2 %A A080321 _Antti Karttunen_, Mar 02 2003