Number of (n+1)X4 0..3 arrays with every 2X2 subblock trace equal to some horizontal or vertical neighbor 2X2 subblock trace.

A185801

Number of (n+1)X4 0..3 arrays with every 2X2 subblock trace equal to some horizontal or vertical neighbor 2X2 subblock trace.

Terms

    a(0) =2176a(1) =260544a(2) =11019840a(3) =593036512a(4) =29410603520

External references