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 A080071 #5 Jan 11 2024 13:06:46 %S A080071 0,1,2,2,3,2,3,3,3,2,4,2,3,3,3,3,4,3,2,3,4,4,3,3,2,4,2,3,4,3,2,4,3,3, %T A080071 3,4,3,2,3,4,3,2,3,6,3,3,3,4,3,3,3,3,3,2,4,3,2,4,5,3,2,4,3,2,3,3,4,2, %U A080071 4,3,2,3,5,2,4,2,6,3,3,3,3,3,2,4,2,3,4,5,5,3,3,2,5,2,5,2,3,4,2,4,3,3,4,3,2 %N A080071 Top-level length of each parenthesization/root degree of general trees encoded in A080070. %F A080071 a(n) = A057515(A080068(n)) %Y A080071 Cf. A080070, A080090. %K A080071 nonn %O A080071 0,3 %A A080071 _Antti Karttunen_, Jan 27 2003