id:A059053 - OEIS Search Results

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Number of orientable necklaces with n beads and two colors (color complements being equivalent); i.e. turning the necklace over neither leaves it unchanged nor simply swaps the colors.

+0
3

0, 0, 0, 0, 0, 0, 0, 1, 2, 7, 12, 31, 58, 126, 234, 484, 906, 1800, 3402, 6643, 12624, 24458, 46686, 90157, 172810, 333498, 641340, 1238671, 2388852, 4620006, 8932032, 17302033, 33522698, 65042526, 126258960, 245361172, 477091232 (list; graph; listen)

	OFFSET	`0,9`
	LINKS	`Illustration of initial terms` `Index entries for sequences related to necklaces`
	FORMULA	`a(n) = A000013(n) - A000011(n) = A000011(n) - A016116(n) = (A000013(n) - A016116(n))/2`
	CROSSREFS	`Adjacent sequences: A059050 A059051 A059052 this_sequence A059054 A059055 A059056` `Sequence in context: A059329 A102371 A007230 this_sequence A032025 A088662 A073710`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Dec 21 2000`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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