Number of nX4 0..2 arrays with every 1 immediately preceded by 0 to the left or above, and every 2 immediately preceded by both a 1 and a 0.
A203367
Number of nX4 0..2 arrays with every 1 immediately preceded by 0 to the left or above, and every 2 immediately preceded by both a 1 and a 0.
Terms
- a(0) =5a(1) =110a(2) =1570a(3) =25087a(4) =386353a(5) =6026844a(6) =93584344a(7) =1455532600a(8) =22625213338a(9) =351763016010
External references
- oeis: A203367