A080970 A014486-indices of the trees whose interior zigzag-tree (Stanley's c) is not branch-reduced (in the sense defined by Donaghey).

4, 8, 9, 10, 13, 14, 17, 19, 21, 22, 23, 24, 25, 26, 27, 28, 31, 33, 35, 36, 37, 38, 41, 42, 44, 45, 46, 50, 51, 52, 54, 56, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 83, 84, 86, 87, 88, 92, 93, 94, 96, 98, 100, 101, 102, 103

Offset: 0

Author

Antti Karttunen, Mar 02 2003

Keywords

• nonn

Links

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

Crossrefs

Cf. A014486, A080300, A080971.

See comment at A080971. Complement of A080980.

Formula

a(n) = A080300(A080971(n)).