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

A223099

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

Terms

    a(0) =0a(1) =24a(2) =546a(3) =13416a(4) =255216a(5) =6939648a(6) =137988216a(7) =3821347968a(8) =77212900320

External references