Number of n X 2 0..4 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

A203185

Number of n X 2 0..4 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

Terms

    a(0) =5a(1) =165a(2) =3209a(3) =53233a(4) =904175a(5) =15703631a(6) =271942421a(7) =4694586685a(8) =81072693659

External references