Number of nX4 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j).

A230671

Number of nX4 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j).

Terms

    a(0) =9a(1) =513a(2) =18915a(3) =730503a(4) =28368687a(5) =1100265795a(6) =42681522741

External references