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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
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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
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Last modified April 18 22:18 EDT 2024. Contains 371782 sequences. (Running on oeis4.)