1/4 the number of nX5 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
A186164
1/4 the number of nX5 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
Terms
- a(0) =7a(1) =2175a(2) =253341a(3) =37402872a(4) =5033988714a(5) =704281652979
External references
- oeis: A186164