A051695 - OEIS

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A051695

Number of degree-n even permutations of order exactly 4.

0, 0, 0, 0, 0, 90, 630, 3780, 18900, 94500, 457380, 3825360, 31505760, 312432120, 2704501800, 22984481520, 179863997040, 1531709328240 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,6`
	FORMULA	`a(n)=(A001473(n)+A051685(n))/2`
	CROSSREFS	`Cf. A048099.` `Sequence in context: A203787 A203780 A065949 * A097372 A101243 A173483` `Adjacent sequences: A051692 A051693 A051694 * A051696 A051697 A051698`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs)`

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Last modified February 13 12:30 EST 2012. Contains 205469 sequences.