1/7 the number of nX3 0..6 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
A185406
1/7 the number of nX3 0..6 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =150a(2) =5040a(3) =279918a(4) =12205368a(5) =595974240a(6) =27536905674
External references
- oeis: A185406