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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -3 |
| 3 | -21 |
| 4 | 185 |
| 5 | 67159 |
| 6 | 11805621 |
| 7 | 2380474563 |
| 8 | 591392066161 |
| 9 | 181472052075695 |
| 10 | 68002767860495981 |
| 11 | 30687549807072450459 |
| 12 | 16452262725440109947177 |
| 13 | 10350119384788050029211399 |
[1,-1,-3,-21,185,67159,11805621,2380474563, 591392066161,181472052075695,68002767860495981, 30687549807072450459,16452262725440109947177, 10350119384788050029211399] |