217872

Appears in sequences

• Number of reversible strings with n-1 beads of 2 colors. 5 beads are black. String is not palindromic.at n=31A032092
• Number of (n+2) X (3+2) 0..3 arrays with every 3 X 3 subblock row and column sum equal to 0 2 3 6 or 7 and every 3 X 3 diagonal and antidiagonal sum not equal to 0 2 3 6 or 7.at n=16A252109