2668340

Appears in sequences

• 1/4 the number of (n+1)X3 0..3 arrays with every 2X2 subblock having exactly two distinct clockwise edge differences.at n=7A209547
• T(n,k)=1/4 the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having exactly two distinct clockwise edge differences.at n=37A209553