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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -2 |
| 3 | 20 |
| 4 | -520 |
| 5 | 26000 |
| 6 | -2132000 |
| 7 | 260104000 |
| 8 | -44217680000 |
| 9 | 9993195680000 |
| 10 | -2898026747200000 |
| 11 | 1049085682486400000 |
| 12 | -463695871658988800000 |
| 13 | 245758811979264064000000 |
| 14 | -153845016299019304064000000 |
| 15 | 112306861898284091966720000000 |
| 16 | -94562377718355205435978240000000 |
| 17 | 90969007365057707629411066880000000 |
[1,-2,20,-520,26000,-2132000,260104000, -44217680000,9993195680000,-2898026747200000, 1049085682486400000,-463695871658988800000, 245758811979264064000000, -153845016299019304064000000, 112306861898284091966720000000, -94562377718355205435978240000000, 90969007365057707629411066880000000] |