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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 16 |
| 3 | -47 |
| 4 | 464 |
| 5 | 1875 |
| 6 | 38144 |
| 7 | 658397 |
| 8 | 13421824 |
| 9 | 309936391 |
| 10 | 8000000000 |
| 11 | 228249336489 |
| 12 | 7132880359424 |
| 13 | 242300085592667 |
| 14 | 8889605514133504 |
| 15 | 350315118408203125 |
| 16 | 14757395823189622784 |
| 17 | 661792256035172208783 |
| 18 | 31477130063116931956736 |
[1,-1,16,-47,464,1875,38144,658397,13421824, 309936391,8000000000,228249336489,7132880359424, 242300085592667,8889605514133504, 350315118408203125,14757395823189622784, 661792256035172208783,31477130063116931956736] |