Number of nX3 0..3 arrays with exactly floor(nX3/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

A222742

Number of nX3 0..3 arrays with exactly floor(nX3/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

Terms

    a(0) =0a(1) =32a(2) =2438a(3) =125094a(4) =6821264a(5) =413021606a(6) =24065512554

External references