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| n | a(n) |
|---|---|
| 0 | -4 |
| 1 | 15 |
| 2 | 765 |
| 3 | 61425 |
| 4 | 1214325 |
| 5 | 95893875 |
| 6 | 2615987248875 |
| 7 | 298915241625 |
| 8 | 10670785663663125 |
| 9 | 10218227413637368125 |
| 10 | 1605716856726047690625 |
| 11 | 56404413605424162403125 |
| 12 | 3387648475383059302662121875 |
| 13 | 744538093174369303262578125 |
[-4,15,765,61425,1214325,95893875,2615987248875, 298915241625,10670785663663125, 10218227413637368125,1605716856726047690625, 56404413605424162403125, 3387648475383059302662121875, 744538093174369303262578125] |