Number of n X 2 0..3 arrays with no more than n elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.

A222839

Number of n X 2 0..3 arrays with no more than n elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.

Terms

    a(0) =1a(1) =8a(2) =105a(3) =1585a(4) =23107a(5) =353631a(6) =5338646a(7) =81874696a(8) =1252153841a(9) =19270376854a(10) =296641979113

External references