Number of nX4 0..3 arrays with values 0..3 introduced in row major order and each element equal to one or two horizontal and vertical neighbors.
A199145
Number of nX4 0..3 arrays with values 0..3 introduced in row major order and each element equal to one or two horizontal and vertical neighbors.
Terms
- a(0) =2a(1) =65a(2) =2453a(3) =125468a(4) =6235011a(5) =316561994a(6) =15958823113a(7) =806680624447
External references
- oeis: A199145