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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -5 |
| 3 | 39 |
| 4 | -345 |
| 5 | 2961 |
| 6 | -24866 |
| 7 | 207759 |
| 8 | -1737670 |
| 9 | 14584625 |
| 10 | -122937305 |
| 11 | 1040906771 |
| 12 | -8852158628 |
| 13 | 75598131215 |
| 14 | -648168748072 |
| 15 | 5577807139921 |
| 16 | -48163964723088 |
| 17 | 417210529188188 |
| 18 | -3624610235789053 |
| 19 | 31575290280786530 |
| 20 | -275758194822813754 |
[1,-1,-5,39,-345,2961,-24866,207759,-1737670, 14584625,-122937305,1040906771,-8852158628, 75598131215,-648168748072,5577807139921, -48163964723088,417210529188188,-3624610235789053, 31575290280786530,-275758194822813754] |