| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 3 |
| 3 | -45 |
| 4 | 315 |
| 5 | -14175 |
| 6 | 467775 |
| 7 | -42567525 |
| 8 | 638512875 |
| 9 | -97692469875 |
| 10 | 9280784638125 |
| 11 | -2143861251406875 |
| 12 | 147926426347074375 |
| 13 | -48076088562799171875 |
| 14 | 9086380738369043484375 |
| 15 | -3952575621190533915703125 |
[1,-1,3,-45,315,-14175,467775,-42567525,638512875, -97692469875,9280784638125,-2143861251406875, 147926426347074375,-48076088562799171875, 9086380738369043484375,-3952575621190533915703125] |