OFFSET
0,2
LINKS
Antti Karttunen, Illustration of initial terms for trees of sizes 3..11
Robert Donaghey, Automorphisms on Catalan trees and bracketing, J. Combin. Theory, Series B, 29 (1980), 75-90.
FORMULA
a(n) = A079442(2n+3)/3.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Antti Karttunen, Jan 27 2003
STATUS
approved