id:A089402 - OEIS Search Results

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Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A089864.

+0
3

1, 1, 2, 3, 8, 22, 68, 217, 720, 2438, 8412, 29414, 104048, 371516, 1337352, 4847637, 17679264, 64823110, 238820780, 883634026, 3282065072, 12233141908, 45741298616, 171529836218, 644952132448, 2430973304732, 9183676744088 (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)+A089408(n))/2`
	PROGRAM	`(Scheme) (define (A089402 n) (* (/ 1 2) (+ (A000108 n) (A089408 n))))`
	CROSSREFS	`Sequence in context: A049959 A006545 A121050 this_sequence A127940 A006796 A006076` `Adjacent sequences: A089399 A089400 A089401 this_sequence A089403 A089404 A089405`
	KEYWORD	`nonn,easy`
	AUTHOR	`Antti Karttunen (His_Firstname.His_Surname(AT)iki.fi), Nov 29 2003`

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.

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