Number of n X n 0..2 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
A203453
Number of n X n 0..2 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =3a(2) =84a(3) =8837a(4) =5660631a(5) =22078482448
External references
- oeis: A203453