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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -2 |
| 3 | 4 |
| 4 | -17 |
| 5 | 113 |
| 6 | -829 |
| 7 | 6921 |
| 8 | -68018 |
| 9 | 766909 |
| 10 | -9668901 |
| 11 | 134950693 |
| 12 | -2070353196 |
| 13 | 34628733267 |
| 14 | -626969184451 |
| 15 | 12218295424331 |
| 16 | -255041910240464 |
| 17 | 5677409949583369 |
| 18 | -134260064803417113 |
| 19 | 3361378755164561417 |
[0,1,-2,4,-17,113,-829,6921,-68018,766909, -9668901,134950693,-2070353196,34628733267, -626969184451,12218295424331,-255041910240464, 5677409949583369,-134260064803417113, 3361378755164561417] |