Number of n X n 0..2 arrays with every nonzero element less than or equal to some NW, E or S neighbor.
A202981
Number of n X n 0..2 arrays with every nonzero element less than or equal to some NW, E or S neighbor.
Terms
- a(0) =1a(1) =9a(2) =1233a(3) =595202a(4) =2075667829
External references
- oeis: A202981