54211

Appears in sequences

• Number of 3Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 0 vertically.at n=10A207243
• Number of nX3 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors.at n=6A283538
• T(n,k)=Number of nXk 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors.at n=42A283543
• Number of 7Xn 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors.at n=2A283548
• Absolute discriminants of imaginary quadratic number fields with elementary bicyclic 5-class group (5,5).at n=10A359871