Number of nX4 0..3 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
A203842
Number of nX4 0..3 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =50a(2) =2706a(3) =84346a(4) =2507842a(5) =83049596a(6) =2828543595a(7) =95696351404
External references
- oeis: A203842