Number of (n+1)X3 0..3 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces.

A186916

Number of (n+1)X3 0..3 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces.

Terms

    a(0) =704a(1) =13440a(2) =253312a(3) =4615296a(4) =86388160a(5) =1613838400a(6) =30161413056a(7) =563483938112

External references