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

A223100

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

Terms

    a(0) =6a(1) =225a(2) =12330a(3) =737254a(4) =45578462a(5) =2870336499a(6) =183046326118

External references