Number of nX4 0..7 arrays with values 0..7 introduced in row major order and no element equal to any horizontal or vertical neighbor.
A198910
Number of nX4 0..7 arrays with values 0..7 introduced in row major order and no element equal to any horizontal or vertical neighbor.
Terms
- a(0) =5a(1) =500a(2) =269940a(3) =319608038a(4) =481871809749
External references
- oeis: A198910