Number of nX3 0..2 arrays with no more than floor(nX3/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order.

A223121

Number of nX3 0..2 arrays with no more than 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) =2a(1) =64a(2) =1154a(3) =33604a(4) =622568a(5) =18539512a(6) =354680696a(7) =10596201904a(8) =206498940320

External references