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, 2979992

Offset

0,3

Comments

Equal to the number of all cycles in the same range (after n>0).

Links

Table of n, a(n) for n=0..10.

Formula

a(n) = A081150(2n) = A081158(n)+A001700(n-1) [where A001700(-1) is taken as 0 here] = A057507(2n) [After n>0].

Crossrefs

Cf. A081152.

Cf. A081150, A081158, A001700, A057507.

Cf. A014137, A014138, A057505, A057506.

Sequence in context: A058409 A125833 A129547 * A132848 A321032 A180036

Adjacent sequences: A081148 A081149 A081150 * A081152 A081153 A081154

Keyword

nonn,more

Author

Wouter Meeussen and Antti Karttunen, Mar 10 2003

Status

approved