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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | -207 |
| 3 | -6218 |
| 4 | -63135 |
| 5 | -373818 |
| 6 | -1561967 |
| 7 | -4941258 |
| 8 | -11012415 |
| 9 | -2693114 |
| 10 | 182475249 |
| 11 | 1762967862 |
| 12 | 13411305505 |
| 13 | 96073279686 |
| 14 | 676747283793 |
| 15 | 4744998619318 |
| 16 | 33228635602305 |
| 17 | 232623538229766 |
| 18 | 1628402577949873 |
[1,6,-207,-6218,-63135,-373818,-1561967,-4941258, -11012415,-2693114,182475249,1762967862, 13411305505,96073279686,676747283793, 4744998619318,33228635602305,232623538229766, 1628402577949873] |