1/6 the number of nX3 0..5 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
A185536
1/6 the number of nX3 0..5 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =110a(2) =2990a(3) =127570a(4) =4403225a(5) =167398110a(6) =6079401960a(7) =225574291125
External references
- oeis: A185536