A174075 - OEIS

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A174075

Number of circular permutations of length n without modular consecutive triples i,i+2,i+4.

18, 93, 600, 4320, 35186 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`5,1`
	COMMENTS	`Circular permutations are permutations whose indices are from the ring of integers modulo n.`
	LINKS	`Table of n, a(n) for n=5..9.`
	EXAMPLE	`Since a(5)=18, there are (5-1)!-18=4 circular permutations with modular consecutive triples i,i+2,i+4 in all circular permutations of length 5. These are exactly (0,2,4,1,3), (0,2,4,3,1), (0,4,2,1,3), and (0,3,2,4,1). Note some have more than one modular progression.`
	CROSSREFS	`Cf. A165962, A174072, A174073, A174074.` `Sequence in context: A117735 A041624 A227812 * A186122 A275253 A034725` `Adjacent sequences: A174072 A174073 A174074 * A174076 A174077 A174078`
	KEYWORD	`nonn`
	AUTHOR	`Isaac Lambert, Mar 06 2010`
	STATUS	`approved`

Last modified June 15 17:43 EDT 2019. Contains 324142 sequences. (Running on oeis4.)