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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | -1999 |
| 3 | -176804 |
| 4 | -4191903 |
| 5 | -48811318 |
| 6 | -362679407 |
| 7 | -1976503200 |
| 8 | -8584169791 |
| 9 | -31340706002 |
| 10 | -99717524751 |
| 11 | -283334343868 |
| 12 | -729167083487 |
| 13 | -1695271383630 |
| 14 | -3371342096815 |
| 15 | -3902194349432 |
| 16 | 15640744525185 |
[1,6,-1999,-176804,-4191903,-48811318,-362679407, -1976503200,-8584169791,-31340706002,-99717524751, -283334343868,-729167083487,-1695271383630, -3371342096815,-3902194349432,15640744525185] |