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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | -1 |
| 3 | -6 |
| 4 | -27 |
| 5 | -60 |
| 6 | 483 |
| 7 | 9422 |
| 8 | 92393 |
| 9 | 507528 |
| 10 | -2635609 |
| 11 | -125548830 |
| 12 | -2109466227 |
| 13 | -20314641204 |
| 14 | 35281684683 |
| 15 | 6713017752758 |
| 16 | 172379768794193 |
| 17 | 2531995009465104 |
| 18 | 6214077724791503 |
| 19 | -977218995921967926 |
[1,0,-1,-6,-27,-60,483,9422,92393,507528,-2635609, -125548830,-2109466227,-20314641204,35281684683, 6713017752758,172379768794193,2531995009465104, 6214077724791503,-977218995921967926] |