Number of ways n couples can sit in a row such that exactly one couple sits next to each other.
A285850
Number of ways n couples can sit in a row such that exactly one couple sits next to each other.
Terms
- a(0) =0a(1) =2a(2) =8a(3) =288a(4) =15744a(5) =1401600a(6) =183582720a(7) =33223034880
External references
- oeis: A285850