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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | -1 |
| 3 | 2 |
| 4 | 17 |
| 5 | 94 |
| 6 | 487 |
| 7 | 2386 |
| 8 | 9473 |
| 9 | 638 |
| 10 | -727729 |
| 11 | -14280542 |
| 12 | -222283631 |
| 13 | -3235193378 |
| 14 | -46058318473 |
| 15 | -649936245646 |
| 16 | -9071848025983 |
| 17 | -123239922765314 |
| 18 | -1562265600970337 |
| 19 | -16288001936745662 |
| 20 | -55920926830283119 |
| 21 | 4236297849575724638 |
| 22 | 201330840708035368199 |
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