56665678

Appears in sequences

• Number of 2nX2 0..3 arrays with values 0..3 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.at n=6A198205
• T(n,k)=Number of 2nX2k 0..3 arrays with values 0..3 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.at n=21A198209