Number of arrangements of 2n couples into n cars such that each car contains 2 men and 2 women but no couple (cars are labeled).
A137801
Number of arrangements of 2n couples into n cars such that each car contains 2 men and 2 women but no couple (cars are labeled).
Terms
- a(0) =0a(1) =6a(2) =900a(3) =748440a(4) =1559930400
External references
- oeis: A137801