Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its west neighbor modulo n and the upper left element equal to 0.
A266306
Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its west neighbor modulo n and the upper left element equal to 0.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =171a(4) =6666a(5) =384360a(6) =30900150a(7) =3314400390a(8) =457970055480
External references
- oeis: A266306