Number of n X n 0..2 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

A202881

Number of n X n 0..2 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

Terms

    a(0) =1a(1) =35a(2) =5493a(3) =6092872a(4) =56006562037

External references