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%I #17 Jan 11 2024 13:06:32
%S 1,1,0,3,0,9,0,21,0,45,0,99,0,195,0,399,0,801,0
%N Number of fixed points in range [A014137(n-1)..A014138(n)] of permutation A071663.
%H R. Donaghey, <a href="https://doi.org/10.1016/0095-8956(80)90045-3">Automorphisms on Catalan trees and bracketing</a>, J. Combin. Theory, Series B, 29 (1980), 75-90.
%H Antti Karttunen, <a href="/A089408/a089408.c.txt">C-program for counting the initial terms of this sequence</a>
%H Antti Karttunen, <a href="/A079442/a079442.pdf">Illustration of initial terms for trees of sizes n=3..11</a>
%F For all n >= 0, a(2n+3)/3 = A079444(n).
%Y Cf. A057505, A071663, A079438, A079441, A079443, A079444.
%Y Occurs in A073202 as row 176609070820803.
%K nonn,more,hard
%O 0,4
%A _Antti Karttunen_, Jan 27 2003
%E Name corrected by _Antti Karttunen_, Dec 13 2017
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