Number of circular permutations with no arithmetic progressions i, ..., i+r, ..., i+2r (mod n) of any equal spacings d.

A174087

Number of circular permutations with no arithmetic progressions i, ..., i+r, ..., i+2r (mod n) of any equal spacings d.

Terms

    a(0) =4a(1) =0a(2) =12a(3) =0a(4) =96a(5) =1296a(6) =1520a(7) =23540a(8) =101472a(9) =686724

External references