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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -3 |
| 3 | 64 |
| 4 | -3375 |
| 5 | 331776 |
| 6 | -52521875 |
| 7 | 12230590464 |
| 8 | -3938980639167 |
| 9 | 1677721600000000 |
| 10 | -913517247483640899 |
| 11 | 619173642240000000000 |
| 12 | -511324276025564512546607 |
| 13 | 505488617542763051300683776 |
[1,-3,64,-3375,331776,-52521875,12230590464, -3938980639167,1677721600000000, -913517247483640899,619173642240000000000, -511324276025564512546607, 505488617542763051300683776] |