Number of nX6 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.
A270056
Number of nX6 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.
Terms
- a(0) =6400a(1) =26891280a(2) =64599504300
External references
- oeis: A270056