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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 16 |
| 3 | 216 |
| 4 | -1280 |
| 5 | -1141504 |
| 6 | -263392128 |
| 7 | -64804059904 |
| 8 | -18858549039104 |
| 9 | -6592583427379200 |
| 10 | -2757743938862710784 |
| 11 | -1367930584522073079808 |
| 12 | -796483574916192660455424 |
| 13 | -539009967859883250211815424 |
[1,2,16,216,-1280,-1141504,-263392128, -64804059904,-18858549039104,-6592583427379200, -2757743938862710784,-1367930584522073079808, -796483574916192660455424, -539009967859883250211815424] |