login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A081163 Number of even cycles in range [A014137(2n)..A014138(2n)] of permutation A057505/A057506, with two fixed-points of A057163. 3
0, 0, 0, 1, 4, 15, 56, 185, 655 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..8.

CROSSREFS

a(n) = A081162(2n+1) = (A000108(n) - A081156(n))/2.

Sequence in context: A064813 A183932 A009940 * A082133 A060111 A077824

Adjacent sequences:  A081160 A081161 A081162 * A081164 A081165 A081166

KEYWORD

nonn

AUTHOR

Wouter Meeussen & Antti Karttunen Mar 10 2003

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 19 13:08 EDT 2019. Contains 321330 sequences. (Running on oeis4.)