id:A107763 - OEIS Search Results

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Number of ways to arrange the numbers (1,3,5,7,9,...,2n-1) in a circle such that every two adjacent numbers are relatively prime.

+0
3

1, 1, 2, 6, 12, 72, 480, 864, 9600, 108000, 312000, 4795200, 46293120, 241056000, 4759413120, 94182359040, 478511953920, 4873965022080, 122634632171520, 799554193966080, 23063946114908160, 664424069072117760 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`Odd analogue of A086595.`
	CROSSREFS	`Cf. A076220, A086595, A102381, A107761, A107762.` `Sequence in context: A136240 A090747 A076220 this_sequence A166470 A144144 A129085` `Adjacent sequences: A107760 A107761 A107762 this_sequence A107764 A107765 A107766`
	KEYWORD	`nonn`
	AUTHOR	`Ray Chandler (rayjchandler(AT)sbcglobal.net), Jun 11 2005`
	EXTENSIONS	`More terms from Max Alekseyev (maxale(AT)gmail.com), Jun 11 2005`

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

AT&T Labs Research