Number of 2nX4 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly one horizontal and vertical neighbor.
A198406
Number of 2nX4 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly one horizontal and vertical neighbor.
Terms
- a(0) =17a(1) =6986a(2) =5057327a(3) =3850206168
External references
- oeis: A198406