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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1008 |
| 2 | 220752 |
| 3 | 16519104 |
| 4 | 399517776 |
| 5 | 4624512480 |
| 6 | 34423752384 |
| 7 | 187506813312 |
| 8 | 814794618960 |
| 9 | 2975666040144 |
| 10 | 9486668147040 |
| 11 | 27052407031104 |
| 12 | 70486610910912 |
| 13 | 169931677686624 |
| 14 | 384163181281152 |
| 15 | 820165393918080 |
| 16 | 1668889095288912 |
| 17 | 3249638073414432 |
[1,-1008,220752,16519104,399517776,4624512480, 34423752384,187506813312,814794618960, 2975666040144,9486668147040,27052407031104, 70486610910912,169931677686624,384163181281152, 820165393918080,1668889095288912,3249638073414432] |