id:A070740 - OEIS Search Results

Search: id:A070740

Displaying 1-1 of 1 results found.

page 1

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).

+0
1

24, 36, 40320, 7200, 479001600, 25401600 (list; graph; listen)

	OFFSET	`2,1`
	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: A003177 A038530 A108190 this_sequence A015805 A164534 A047982` `Adjacent sequences: A070737 A070738 A070739 this_sequence A070741 A070742 A070743`
	KEYWORD	`nonn`
	AUTHOR	`Sharon Sela (sharonsela(AT)hotmail.com), May 14 2002`

page 1

Search completed in 0.002 seconds

Last modified November 29 12:46 EST 2009. Contains 167659 sequences.