A070740 - OEIS

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A070740

Order of the subgroup of the symmetric group S_(2n) generated by the 2 cycles : (1,2,...n,2n,2n-1,...,n+1) and (1,2,...,2n).

24, 36, 40320, 7200, 479001600, 25401600 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`2,1`
	LINKS	`Table of n, a(n) for n=2..7.`
	FORMULA	`If n is even: a(n) = (2n)! If n is congruent to 1 mod 4: a(n) = (n!)^2 / 2 If n is congruent to 3 mod 4: a(n) = (n!)^2`
	CROSSREFS	`Cf. A001044, A010050.` `Sequence in context: A108190 A185489 A172424 * A175460 A015805 A164534` `Adjacent sequences: A070737 A070738 A070739 * A070741 A070742 A070743`
	KEYWORD	`nonn`
	AUTHOR	`Sharon Sela (sharonsela(AT)hotmail.com), May 14 2002`
	STATUS	`approved`

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Last modified June 20 05:36 EDT 2013. Contains 226419 sequences.