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

A222850

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

Terms

    a(0) =2a(1) =51a(2) =737a(3) =19446a(4) =292257a(5) =7998180a(6) =124148448a(7) =3439829096a(8) =54306296841

External references