A081151 - OEIS

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A081151

Number of even cycles in range [A014137(2n-1)..A014138(2n-1)] of permutation A057505/A057506.

0, 1, 3, 18, 95, 528, 2936, 16212, 90717, 516358 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	COMMENTS	`Equal to the number of all cycles in the same range (after n>0).`
	CROSSREFS	`a(n) = A081150(2n) = A081158(n)+A001700(n-1) [where A001700(-1) is taken as 0 here] = A057507(2n) [After n>0]. Cf. A081152.` `Sequence in context: A058409 A125833 A129547 * A132848 A180036 A038158` `Adjacent sequences: A081148 A081149 A081150 * A081152 A081153 A081154`
	KEYWORD	`nonn`
	AUTHOR	`Wouter Meeussen (wouter.meeussen(AT)pandora.be) & Antti Karttunen (Firstname.Surname(AT)iki.fi) Mar 10 2003`

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Last modified February 14 11:36 EST 2012. Contains 205623 sequences.