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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 1 |
| 3 | -55 |
| 4 | 217 |
| 5 | -4219 |
| 6 | 214279 |
| 7 | -802171 |
| 8 | 824071 |
| 9 | -109684277 |
| 10 | 337533513773 |
| 11 | -760100160121 |
| 12 | 8320611986431 |
| 13 | -265779449377027 |
| 14 | 2303253020856673 |
| 15 | -417652078505070229 |
| 16 | 7111553692366818727 |
| 17 | -7396136516120375032117 |
[1,-1,1,-55,217,-4219,214279,-802171,824071, -109684277,337533513773,-760100160121, 8320611986431,-265779449377027,2303253020856673, -417652078505070229,7111553692366818727, -7396136516120375032117] |