Number of 2nX4 0..4 arrays with values 0..4 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.
A198509
Number of 2nX4 0..4 arrays with values 0..4 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.
Terms
- a(0) =59a(1) =4666a(2) =308854a(3) =23016128a(4) =1768050096a(5) =137433138206
External references
- oeis: A198509