Number of nX2 0..3 arrays with no more than floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order.

A222825

Number of nX2 0..3 arrays with no more than floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order.

Terms

    a(0) =1a(1) =8a(2) =80a(3) =1154a(4) =14388a(5) =200082a(6) =2652496a(7) =36622104a(8) =498427856a(9) =6893943128a(10) =95040804864

External references