login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A174078 Number of circular permutations of length n with no consecutive triples i,i+2,i+4 or i,i-2,i-4. 3
20, 100, 600, 4244, 34264, 311424, 3143912, 34833964, 420917638, 5513592091, 77715460917 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,1

COMMENTS

Circular permutations are permutations whose indices are from the ring of integers modulo n.

LINKS

Table of n, a(n) for n=5..15.

EXAMPLE

For n=5 there are (5-1)!-a(5)=4 circular permutations with i,i+2,i+4 or i,i-2,i-4 triples. They are (0,2,4,1,3), (0,2,4,3,1), (0,1,3,4,2), and (0,3,1,4,2).

CROSSREFS

Cf. A165964, A174076, A174077, A174079.

Sequence in context: A188050 A027986 A240437 * A239857 A041772 A043462

Adjacent sequences:  A174075 A174076 A174077 * A174079 A174080 A174081

KEYWORD

nonn

AUTHOR

Isaac Lambert, Mar 10 2010

EXTENSIONS

a(10)-a(15) from Donovan Johnson, Sep 24 2010

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 January 20 04:53 EST 2021. Contains 340301 sequences. (Running on oeis4.)