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A174079
Number of circular permutations of length n with no consecutive triples i,i+2,i+4 (mod n) or i,i-2,i-4 (mod n).
3
12, 84, 494, 3696, 30574
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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..9.
EXAMPLE
For n=5 there are (5-1)!-a(5)=12 circular permutations with triples i,i+2,i+4 (mod 5) or triples i,i-2,i-4 (mod 5). An example of one is (0,3,1,2,4) because of the progression 0,3,1 (mod 5).
CROSSREFS
Cf.
A078628
,
A174076
,
A174077
,
A174078
.
Sequence in context:
A004407
A054849
A000761
*
A003209
A155645
A336907
Adjacent sequences:
A174076
A174077
A174078
*
A174080
A174081
A174082
KEYWORD
nonn
AUTHOR
Isaac Lambert
, Mar 10 2010
STATUS
approved
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Last modified March 18 21:02 EDT 2024. Contains 370951 sequences. (Running on oeis4.)