Number of (n+1) X 3 0..3 arrays with every 2 X 2 subblock sum equal to exactly one or two horizontal and vertical neighbor 2 X 2 subblock sums.

A188368

Number of (n+1) X 3 0..3 arrays with every 2 X 2 subblock sum equal to exactly one or two horizontal and vertical neighbor 2 X 2 subblock sums.

Terms

    a(0) =704a(1) =15776a(2) =315520a(3) =6781400a(4) =146491208a(5) =3204417424a(6) =70324529528

External references