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| n | a(n) |
|---|---|
| 1 | -8 |
| 2 | -18 |
| 3 | -8 |
| 4 | 318 |
| 5 | 3352 |
| 6 | 26142 |
| 7 | 183112 |
| 8 | 1216638 |
| 9 | 7842232 |
| 10 | 49591902 |
| 11 | 309595432 |
| 12 | 1915328958 |
| 13 | 11771279512 |
| 14 | 71987413662 |
| 15 | 438579282952 |
| 16 | 2664183937278 |
| 17 | 16146410851192 |
| 18 | 97676152243422 |
| 19 | 590010212989672 |
| 20 | 3559688008961598 |
| 21 | 21455704973213272 |
| 22 | 129219894479953182 |
| 23 | 777738831202779592 |
[-8,-18,-8,318,3352,26142,183112,1216638,7842232, 49591902,309595432,1915328958,11771279512, 71987413662,438579282952,2664183937278, 16146410851192,97676152243422,590010212989672, 3559688008961598,21455704973213272, 129219894479953182,777738831202779592] |