Number of nX5 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.
A270055
Number of nX5 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.
Terms
- a(0) =1280a(1) =1683240a(2) =1248460920a(3) =779206497960
External references
- oeis: A270055