

A174082


Number of circular permutations of length n with no consecutive triples i,i+d,i+2d for all d.


3




OFFSET

4,1


COMMENTS

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


LINKS



EXAMPLE

For n=4 there is only (31)!a(4)=1 circular permutation with a consecutive triple i,i+d,i+2d. It is (0,1,2,3).


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



