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A081162 Number of even cycles in range [A014137(n-1)..A014138(n-1)] of permutation A057505/A057506, with two fixed-points of A057163. 4
0, 0, 0, 0, 0, 0, 0, 1, 0, 4, 0, 15, 0, 56, 0, 185, 0, 655, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,10

COMMENTS

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

LINKS

Table of n, a(n) for n=0..18.

CROSSREFS

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

Sequence in context: A233398 A006710 A141150 * A095367 A060052 A059065

Adjacent sequences:  A081159 A081160 A081161 * A081163 A081164 A081165

KEYWORD

nonn

AUTHOR

Wouter Meeussen & Antti Karttunen Mar 10 2003

STATUS

approved

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Last modified July 30 04:51 EDT 2021. Contains 346348 sequences. (Running on oeis4.)