Number of nX4 0..4 arrays with values 0..4 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.
A198704
Number of nX4 0..4 arrays with values 0..4 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.
Terms
- a(0) =2a(1) =76a(2) =3893a(3) =322230a(4) =30407251a(5) =3075124662a(6) =316137386807
External references
- oeis: A198704