Half the number of (n+1)X7 0..3 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference.
A209785
Half the number of (n+1)X7 0..3 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference.
Terms
- a(0) =3520628a(1) =2641341716
External references
- oeis: A209785