Half the number of n X n binary arrays with each element equal to at least two neighbors.
A180751
Half the number of n X n binary arrays with each element equal to at least two neighbors.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =9a(4) =86a(5) =2986a(6) =205020a(7) =33329847a(8) =11843513563
External references
- oeis: A180751