Number of seating arrangements of n couples around a round table (up to rotations) so that each person sits between two people of the opposite sex and no couple is seated together.
A094047
Number of seating arrangements of n couples around a round table (up to rotations) so that each person sits between two people of the opposite sex and no couple is seated together.
Terms
- a(0) =0a(1) =0a(2) =2a(3) =12a(4) =312a(5) =9600a(6) =416880a(7) =23879520a(8) =1749363840a(9) =159591720960
External references
- oeis: A094047