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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -6 |
| 3 | 36 |
| 4 | -251 |
| 5 | 1961 |
| 6 | -16477 |
| 7 | 145307 |
| 8 | -1326227 |
| 9 | 12420057 |
| 10 | -118666032 |
| 11 | 1152120806 |
| 12 | -11333969511 |
| 13 | 112728949041 |
| 14 | -1131701419316 |
| 15 | 11452480598696 |
| 16 | -116702578057106 |
| 17 | 1196469605151736 |
| 18 | -12332629378843566 |
| 19 | 127727907921601146 |
| 20 | -1328542834131885506 |
[1,1,-6,36,-251,1961,-16477,145307,-1326227, 12420057,-118666032,1152120806,-11333969511, 112728949041,-1131701419316,11452480598696, -116702578057106,1196469605151736, -12332629378843566,127727907921601146, -1328542834131885506] |