Number of nX4 0..6 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
A203385
Number of nX4 0..6 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =252a(2) =65653a(3) =7951793a(4) =781413998a(5) =87523201775
External references
- oeis: A203385