A048099 - OEIS

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A048099

Number of degree-n even permutations of order exactly 2.

0, 0, 0, 3, 15, 45, 105, 315, 1323, 5355, 18315, 63855, 272415, 1264263, 5409495, 22302735, 101343375, 507711375, 2495918223, 11798364735, 58074029055, 309240315615 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,4`
	LINKS	`Table of n, a(n) for n=1..22.`
	FORMULA	`a(n)=(A001189(n)+A051684(n))/2`
	CROSSREFS	`Cf. A001189, A051695.` `Sequence in context: A112810 A094191 A050534 * A030505 A074355 A201868` `Adjacent sequences: A048096 A048097 A048098 * A048100 A048101 A048102`
	KEYWORD	`easy,nonn,changed`
	AUTHOR	`Vladeta Jovovic`
	STATUS	`approved`

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Last modified June 19 08:11 EDT 2013. Contains 226399 sequences.