Number of n X n 0..1 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
A202972
Number of n X n 0..1 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =2a(2) =17a(3) =385a(4) =31380a(5) =8071997a(6) =6330398606
External references
- oeis: A202972