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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -2 |
| 3 | -1 |
| 4 | 253 |
| 5 | 12854 |
| 6 | 668053 |
| 7 | 39148199 |
| 8 | 2456262898 |
| 9 | 130790155859 |
| 10 | -3853032641387 |
| 11 | -4312625669814166 |
| 12 | -1531200886955161127 |
| 13 | -489884373969089299201 |
| 14 | -159097972223555719000922 |
| 15 | -54064488830901650420384521 |
| 16 | -19284261543086608770504566147 |
[1,-1,-2,-1,253,12854,668053,39148199,2456262898, 130790155859,-3853032641387,-4312625669814166, -1531200886955161127,-489884373969089299201, -159097972223555719000922, -54064488830901650420384521, -19284261543086608770504566147] |