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 A080271 #5 Jan 11 2024 10:52:31 %S A080271 0,4,39,4157,48951,7810096,1396038023,53725275266610,771558836472208, %T A080271 162485296061436675,34997250890683907797,1707178675072552289362060, %U A080271 384389569381056309586675602,20058720841018817533793283102645 %N A080271 a(n) = A080301(A080268(n)). %Y A080271 Cf. A080270. %K A080271 nonn %O A080271 0,2 %A A080271 _Antti Karttunen_, Mar 02 2003