The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | 1 |
| 8 | 2 |
| 9 | 2 |
| 10 | 2 |
| 11 | 2 |
| 12 | 20 |
| 13 | 14 |
| 14 | 12 |
| 15 | 14 |
| 16 | 20 |
| 17 | 80 |
| 18 | 80 |
| 19 | 80 |
| 20 | 80 |
| 21 | 80 |
| 22 | 80 |
| 23 | 840 |
| 24 | 720 |
| 25 | 648 |
| 26 | 624 |
| 27 | 648 |
| 28 | 720 |
| 29 | 840 |
[0,0,0,1,0,1,2,2,2,2,20,14,12,14,20,80,80,80,80, 80,80,840,720,648,624,648,720,840] |