Number of nX3 0..3 arrays with no more than floor(nX3/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

A223038

Number of nX3 0..3 arrays with no more than floor(nX3/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

Terms

    a(0) =2a(1) =98a(2) =3780a(3) =255943a(4) =10904199a(5) =751990800a(6) =33007705273

External references