688122928

Appears in sequences

• Half the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference.at n=2A210292
• Half the number of (n+1)X4 0..3 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference.at n=2A210295
• T(n,k)=Half the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference.at n=12A210300