Number of n X n 0..5 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
A203331
Number of n X n 0..5 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =6a(2) =1311a(3) =2224079a(4) =40063085907
External references
- oeis: A203331