Number of n X 2 0..3 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

A203095

Number of n X 2 0..3 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

Terms

    a(0) =4a(1) =84a(2) =1080a(3) =12260a(4) =143510a(5) =1705124a(6) =20174774a(7) =238288768a(8) =2816078514a(9) =33286887866a(10) =393430889634

External references