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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -3 |
| 2 | 24 |
| 3 | -273 |
| 4 | 3399 |
| 5 | -31728 |
| 6 | -280371 |
| 7 | 26388177 |
| 8 | -580539936 |
| 9 | -17406321933 |
| 10 | 1809690920979 |
| 11 | -18045563411208 |
| 12 | -6249108953966151 |
| 13 | 333062472085204677 |
| 14 | 27673022056089337224 |
| 15 | -3800202930423874873353 |
| 16 | -139584280492439116159521 |
| 17 | 52779027474493111545620352 |
| 18 | 279012844299708383976573189 |
[1,-3,24,-273,3399,-31728,-280371,26388177, -580539936,-17406321933,1809690920979, -18045563411208,-6249108953966151, 333062472085204677,27673022056089337224, -3800202930423874873353,-139584280492439116159521, 52779027474493111545620352, 279012844299708383976573189] |