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Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A073286/A073287.
2

%I #6 Mar 31 2012 14:02:17

%S 1,1,2,4,10,26,74,222,698,2264,7536,25600,88406,309440,1095354,

%T 3914340,14102324,51165004,186774368,685495334,2527957006

%N Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A073286/A073287.

%C The number of orbits to which the corresponding automorphism(s) partitions the set of A000108(n) binary trees with n internal nodes.

%H A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a>

%K nonn

%O 0,3

%A _Antti Karttunen_, Nov 29 2003