Number of nX4 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
A203342
Number of nX4 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =95a(2) =9555a(3) =503409a(4) =23912553a(5) =1288066857a(6) =72606563663
External references
- oeis: A203342