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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | -18 |
| 3 | 270 |
| 4 | -4902 |
| 5 | 98538 |
| 6 | -2110794 |
| 7 | 47227846 |
| 8 | -1090742094 |
| 9 | 25806364434 |
| 10 | -622267199554 |
| 11 | 15236456140542 |
| 12 | -377814588773622 |
| 13 | 9468373002766074 |
| 14 | -239434464005544570 |
| 15 | 6101951612867546166 |
| 16 | -156561081975745809566 |
| 17 | 4040863076496835880226 |
[1,2,-18,270,-4902,98538,-2110794,47227846, -1090742094,25806364434,-622267199554, 15236456140542,-377814588773622,9468373002766074, -239434464005544570,6101951612867546166, -156561081975745809566,4040863076496835880226] |