1/8 the number of nX4 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
A185901
1/8 the number of nX4 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
Terms
- a(0) =8a(1) =2765a(2) =546280a(3) =139230658a(4) =32611077940
External references
- oeis: A185901