id:A078603 - OEIS Search Results

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Number of ways of arranging the numbers 1..n in a circle so that adjacent numbers do not differ by 1 mod n.

+0
3

1, 0, 0, 2, 6, 46, 354, 3106, 29926, 315862, 3628906, 45132474, 604534846, 8680957902, 133082437730, 2169964347282, 37505486702678, 685046187718022, 13186335387855770, 266816610979894058, 5662225862272325550 (list; graph; listen)

	OFFSET	`1,4`
	LINKS	`Index entries for sequences related to shoe lacings`
	FORMULA	`See A002816.`
	EXAMPLE	`a(5) = 2: 1 3 5 2 4, 1 4 2 5 3; a(6) = 6: 1 4 6 2 5 3, 1 5 2 4 6 3, 1 5 3 6 2 4, 1 3 6 4 2 5, 1 4 2 6 3 5, 1 3 5 2 6 4.`
	CROSSREFS	`Twice A002816. See also A078628.` `Sequence in context: A136557 A092662 A052811 this_sequence A001587 A078537 A072444` `Adjacent sequences: A078600 A078601 A078602 this_sequence A078604 A078605 A078606`
	KEYWORD	`nonn`
	AUTHOR	`njas, Dec 11 2002`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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