A079442 Number of fixed points in range [A014137(n-1)..A014138(n)] of permutation A071663.
1, 1, 0, 3, 0, 9, 0, 21, 0, 45, 0, 99, 0, 195, 0, 399, 0, 801, 0
Offset: 0
Links
- R. Donaghey, Automorphisms on Catalan trees and bracketing, J. Combin. Theory, Series B, 29 (1980), 75-90.
- Antti Karttunen, C-program for counting the initial terms of this sequence
- Antti Karttunen, Illustration of initial terms for trees of sizes n=3..11
Crossrefs
Formula
For all n >= 0, a(2n+3)/3 = A079444(n).
Extensions
Name corrected by Antti Karttunen, Dec 13 2017
Comments