Number of n X n 0..3 arrays with every nonzero element less than or equal to some NW, E or S neighbor.
A203390
Number of n X n 0..3 arrays with every nonzero element less than or equal to some NW, E or S neighbor.
Terms
- a(0) =1a(1) =16a(2) =7785a(3) =18530502a(4) =474618867194
External references
- oeis: A203390