id:A107762 - OEIS Search Results

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Number of permutations of (1,3,5,7,9,...,2n-1) in which every pair of adjacent numbers as well as the first and the last entries are relatively prime.

+0
3

1, 2, 6, 24, 60, 432, 3360, 6912, 86400, 1080000, 3432000, 57542400, 601810560, 3374784000, 71391196800, 1506917744640, 8134703216640, 87731370397440, 2330058011258880, 15991083879321600, 484342868413071360 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Odd analogue of A102381. Equals n*A107763(n).`
	CROSSREFS	`Cf. A076220, A086595, A102381, A107761, A107763.` `Sequence in context: A104114 A118038 A022917 this_sequence A027562 A096259 A087645` `Adjacent sequences: A107759 A107760 A107761 this_sequence A107763 A107764 A107765`
	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 November 25 20:09 EST 2009. Contains 167514 sequences.

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