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

Author

Wouter Meeussen and Antti Karttunen, Mar 10 2003

Keywords

• nonn
• more

Comments

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

Crossrefs

Cf. A081152.

Cf. A081150, A081158, A001700, A057507.

Cf. A014137, A014138, A057505, A057506.

Formula

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