Number of nX3 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.
A270053
Number of nX3 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.
Terms
- a(0) =40a(1) =5400a(2) =385200a(3) =22911300a(4) =1248460920a(5) =64599504300
External references
- oeis: A270053