Number of n X 3 binary arrays with every 1 immediately preceded by 0 0 to the left or above.

A203103

Number of n X 3 binary arrays with every 1 immediately preceded by 0 0 to the left or above.

Terms

    a(0) =2a(1) =4a(2) =23a(3) =90a(4) =296a(5) =1125a(6) =4314a(7) =15844a(8) =58745a(9) =219868a(10) =818576a(11) =3044097a(12) =11340602a(13) =42241116a(14) =157267719a(15) =585625606a(16) =2180889380a(17) =8121134761a(18) =30241203842a(19) =112613417592a(20) =419352246749

External references