31161462

Appears in sequences

• Half the number of (n+1) X 2 0..3 arrays with every 2 X 2 subblock having exactly one duplicate clockwise edge difference.at n=6A209780
• Half the number of (n+1)X8 0..3 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference.at n=0A209786
• T(n,k)=Half the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference.at n=21A209787