A081163 - OEIS

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A081163

Number of even cycles in range [A014137(2n)..A014138(2n)] of permutation A057505/A057506, with two fixed-points of A057163.

0, 0, 0, 1, 4, 15, 56, 185, 655 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	CROSSREFS	`a(n) = A081162(2n+1) = (A000108(n) - A081156(n))/2.` `Sequence in context: A064813 A183932 A009940 * A082133 A060111 A077824` `Adjacent sequences: A081160 A081161 A081162 * A081164 A081165 A081166`
	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 15 21:23 EST 2012. Contains 205856 sequences.