a(n) is the number of different ways to seat a set of n married male-female couples at a straight table so that men and women alternate and every man is separated by at least two men from his wife.
A270174
a(n) is the number of different ways to seat a set of n married male-female couples at a straight table so that men and women alternate and every man is separated by at least two men from his wife.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =240a(5) =8640a(6) =584640a(7) =40239360a(8) =3493808640a(9) =364941158400
External references
- oeis: A270174