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A079444
Number of 3-cycles in range [A014137(2n+2)..A014138(2n+2)] of permutation A057505 (= Donaghey's automorphism M).
4
1, 3, 7, 15, 33, 65, 133, 267
OFFSET
0,2
LINKS
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
Sequence in context: A307573 A134195 A365527 * A269560 A146654 A363503
KEYWORD
nonn,more
AUTHOR
Antti Karttunen, Jan 27 2003
STATUS
approved