698688

Appears in sequences

• Number of ways to arrange 5 nonattacking queens on the lower triangle of an n X n board.at n=12A194495
• Number of (n+2) X (2+2) 0..2 arrays with every consecutive three elements in every row, column, diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=12A252855