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 A080970 #7 Jan 11 2024 02:52:38 %S A080970 4,8,9,10,13,14,17,19,21,22,23,24,25,26,27,28,31,33,35,36,37,38,41,42, %T A080970 44,45,46,50,51,52,54,56,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72, %U A080970 73,74,75,76,77,78,79,80,83,84,86,87,88,92,93,94,96,98,100,101,102,103 %N A080970 A014486-indices of the trees whose interior zigzag-tree (Stanley's c) is not branch-reduced (in the sense defined by Donaghey). %H A080970 Robert Donaghey, <a href="https://doi.org/10.1016/0095-8956(80)90045-3">Automorphisms on Catalan trees and bracketing</a>, J. Combin. Theory, Series B, 29 (1980), 75-90. %F A080970 a(n) = A080300(A080971(n)). %Y A080970 Cf. A014486, A080300, A080971. %Y A080970 See comment at A080971. Complement of A080980. %K A080970 nonn %O A080970 0,1 %A A080970 _Antti Karttunen_, Mar 02 2003