A080980 A014486-indices of the trees whose interior zigzag-tree (Stanley's c) is branch-reduced (in the sense defined by Donaghey).

0, 1, 2, 3, 5, 6, 7, 11, 12, 15, 16, 18, 20, 29, 30, 32, 34, 39, 40, 43, 47, 48, 49, 53, 55, 57, 81, 82, 85, 89, 90, 91, 95, 97, 99, 113, 114, 116, 118, 123, 124, 136, 137, 139, 140, 141, 143, 146, 155, 159, 160, 161, 165, 167, 173, 183, 245, 246, 248, 250, 255, 256, 268

Offset

0,3

Links

Table of n, a(n) for n=0..62.

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

R. P. Stanley, Exercises on Catalan and Related Numbers

Crossrefs

Cf. A080979. a(n) = A080300(A080981(n)). See comment at A080981. Complement of A080970.

Sequence in context: A339267 A288863 A121700 * A334067 A134669 A342392

Adjacent sequences: A080977 A080978 A080979 * A080981 A080982 A080983

Keyword

nonn

Author

Antti Karttunen, Mar 02 2003

Status

approved