id:A089880 - OEIS Search Results

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Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A069772.

+0
2

1, 1, 2, 3, 10, 22, 76, 217, 750, 2438, 8524, 29414, 104468, 371516, 1338936, 4847637, 17685270, 64823110, 238843660, 883634026, 3282152588, 12233141908, 45741634536, 171529836218, 644953425740, 2430973304732, 9183681736376 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`The number of orbits to which the corresponding automorphism(s) partitions the set of A000108(n) binary trees with n internal nodes.`
	LINKS	`A. Karttunen, C-program for computing the initial terms of this sequence`
	FORMULA	`a(n) = (A000108(n)+A089849(n))/2`
	PROGRAM	`(Scheme) (define (A089880 n) (/ (+ (A000108 n) (A089849 n)) 2))`
	CROSSREFS	`Sequence in context: A120484 A113202 A079078 this_sequence A130002 A105286 A059929` `Adjacent sequences: A089877 A089878 A089879 this_sequence A089881 A089882 A089883`
	KEYWORD	`nonn,easy`
	AUTHOR	`Antti Karttunen (His_Firstname.His_Surname(AT)iki.fi), Nov 29 2003`

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Last modified July 23 17:35 EDT 2008. Contains 142285 sequences.

AT&T Labs Research