| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 315 |
| 3 | 5040 |
| 4 | 85680 |
| 5 | 278460 |
| 6 | 42840 |
| 7 | 14608440 |
| 8 | 540512280 |
| 9 | 10810245600 |
| 10 | 46844397600 |
| 11 | 480155075400 |
| 12 | 145486987846200 |
| 13 | 17749412517236400 |
| 14 | 5916470839078800 |
| 15 | 10769949084069775600 |
| 16 | 312328523438023492400 |
[15,315,5040,85680,278460,42840,14608440, 540512280,10810245600,46844397600,480155075400, 145486987846200,17749412517236400, 5916470839078800,10769949084069775600, 312328523438023492400] |