1971161340

Appears in sequences

• Number of n X n 0..3 arrays avoiding the pattern z z+1 z horizontally and z z-1 z vertically.at n=3A209086
• Number of nX4 0..3 arrays avoiding the pattern z z+1 z horizontally and z z-1 z vertically.at n=3A209088
• T(n,k)=Number of nXk 0..3 arrays avoiding the pattern z z+1 z horizontally and z z-1 z vertically.at n=24A209092