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A079440 Number of transpositions (2-cycles) in range [A014137(n-1)..A014138(n-1)] of permutation A057505 (= Donaghey's automorphism M). 4
0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 6, 6, 6, 7, 8, 8, 9, 9, 11, 12, 12, 12, 14, 14, 14, 15, 17, 17, 18, 18, 19, 20, 20, 20, 23, 23, 23, 24, 25, 25, 26, 26, 28, 29, 29, 29, 31, 31, 31, 32, 34, 34, 35, 35, 36, 37, 37, 37, 40, 40, 40, 41, 42, 42, 43, 43, 45, 46, 46, 46, 48, 48, 48 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,6
LINKS
Robert Donaghey, Automorphisms on Catalan trees and bracketing, J. Combin. Theory, Series B, 29 (1980), 75-90.
MAPLE
A079440 := n -> floor((n+1)/3) + `if`((n>=14), floor((n-10)/4)+floor((n-14)/8), 0);
CROSSREFS
From n>= 2 onward a(n) = A079438(n)/2 (with the same reservation). Cf. A079444.
Sequence in context: A350327 A053264 A343347 * A192262 A026414 A353090
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 27 2003
STATUS
approved

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Last modified March 28 07:33 EDT 2024. Contains 371235 sequences. (Running on oeis4.)