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A080971 A014486-encodings of the trees whose interior zigzag-tree (Stanley's c) is not branch-reduced (in the sense defined by Donaghey). 4

%I

%S 42,56,170,172,184,202,212,226,232,240,682,684,690,692,696,714,724,

%T 738,744,752,810,812,824,842,850,852,856,880,906,908,916,930,936,944,

%U 962,964,968,976,992,2730,2732,2738,2740,2744,2762,2764,2770,2772,2776,2786

%N A014486-encodings of the trees whose interior zigzag-tree (Stanley's c) is not branch-reduced (in the sense defined by Donaghey).

%D R. Donaghey, Automorphisms on Catalan trees and bracketing, J. Combin. Theory, Series B, 29 (1980), 75-90.

%H A. Karttunen, <a href="/A014486/a014486.ps.gz">Initial terms illustrated in positions 4, 8, 9, 10, 13, 14, 17, 19, 21, 22, 23, 24, 25, 26, 27, 28, 31, ...</a>

%Y a(n) = A014486(A080970(n)). Cf. A080981.

%K nonn

%O 0,1

%A _Antti Karttunen_ Mar 02 2003

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Last modified October 20 17:50 EDT 2019. Contains 328268 sequences. (Running on oeis4.)