OFFSET
0,6
LINKS
Robert Donaghey, Automorphisms on Catalan trees and bracketing, J. Combin. Theory, Series B, 29 (1980), 75-90.
Antti Karttunen, Illustration of initial terms for trees of sizes n=2..18
MAPLE
A079440 := n -> floor((n+1)/3) + `if`((n>=14), floor((n-10)/4)+floor((n-14)/8), 0);
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 27 2003
STATUS
approved