1/5 the number of nX3 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
A185819
1/5 the number of nX3 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =76a(2) =1584a(3) =49036a(4) =1266624a(5) =35446376a(6) =956312244a(7) =26231137608a(8) =714107480512
External references
- oeis: A185819