A080970 - OEIS

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A080970

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

4

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,1

LINKS

Table of n, a(n) for n=0..68.

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

FORMULA

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

CROSSREFS

Cf. A014486, A080300, A080971.

See comment at A080971. Complement of A080980.

Sequence in context: A155101 A158582 A144754 * A288862 A274584 A210998

Adjacent sequences: A080967 A080968 A080969 * A080971 A080972 A080973

KEYWORD

nonn

AUTHOR

Antti Karttunen, Mar 02 2003

STATUS

approved