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

A222872

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

Terms

    a(0) =1a(1) =11a(2) =131a(3) =2150a(4) =32491a(5) =533186a(6) =8362152a(7) =135650378a(8) =2155759835a(9) =34780282521a(10) =555913562689

External references