A081162 Number of even cycles in range [A014137(n-1)..A014138(n-1)] of permutation A057505/A057506, with two fixed-points of A057163.

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

Offset: 0

Author

Wouter Meeussen and Antti Karttunen, Mar 10 2003

Keywords

• nonn
• more

Comments

Because A057163 can fix only binary trees of odd size, the even-indexed terms are all 0.

Crossrefs

Bisection: A081163. Cf. A081150, A081157, A081160.

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