Number of nX4 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.
A270054
Number of nX4 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.
Terms
- a(0) =240a(1) =99840a(2) =22911300a(3) =4410058320a(4) =779206497960
External references
- oeis: A270054