Number of n X n 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
A203339
Number of n X n 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =5a(2) =635a(3) =503409a(4) =3742207236
External references
- oeis: A203339