Number of nX4 0..3 arrays with exactly floor(nX4/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

A223050

Number of nX4 0..3 arrays with exactly floor(nX4/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

Terms

    a(0) =6a(1) =508a(2) =95648a(3) =17704612a(4) =3345698159a(5) =642902149269

External references