A081158 Number of even cycles in range [A014137(2n-1)..A014138(2n-1)] of permutation A057505/A057506, with no fixed points of A057164.

0, 0, 0, 8, 60, 402, 2474, 14496, 84282, 492048

Offset: 0

Author

Wouter Meeussen and Antti Karttunen, Mar 10 2003

Keywords

• nonn
• more

Crossrefs

Cf. A081157, A081151, A001700.

Cf. A014137, A014138, A057505, A057506, A057164.

Formula

a(n) = A081157(2n) = A081151(n) - A001700(n-1) [where A001700(-1) is taken as 0 here].