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.

3

0, 0, 0, 1, 4, 15, 56, 185, 655

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OFFSET

0,5

LINKS

Table of n, a(n) for n=0..8.

FORMULA

a(n) = A081162(2n+1) = (A000108(n) - A081156(n))/2.

CROSSREFS

Cf. A081162, A000108, A081156.

Cf. A014137, A014138, A057505, A057506, A057163.

Sequence in context: A064813 A183932 A009940 * A082133 A060111 A077824

Adjacent sequences: A081160 A081161 A081162 * A081164 A081165 A081166

KEYWORD

nonn,more

AUTHOR

Wouter Meeussen and Antti Karttunen, Mar 10 2003

STATUS

approved