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 A080068 #13 Sep 02 2025 21:25:49 %S A080068 0,1,2,5,11,34,82,287,923,3016,8664,37407,102983,414050,1488140, %T A080068 5330976,19367263,76887675,255935344,808348061,3420607749,14063447808, %U A080068 52376853939,178612888734,666146253450,2182739853536,10254827577242,31021294603020,132781022354213 %N A080068 Iterates of A080067. %F A080068 a(0) = 0, a(n) = A080067(a(n-1)). %Y A080068 Corresponding totally balanced binary sequences in A063171: A080070. %Y A080068 Cf. A080067. %K A080068 nonn,changed %O A080068 0,3 %A A080068 _Antti Karttunen_, Jan 27 2003 %E A080068 More terms from _Sean A. Irvine_, Sep 02 2025