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| n | a(n) |
|---|---|
| 3 | 8 |
| 4 | 48 |
| 5 | 2592 |
| 6 | 113856 |
| 7 | 3777664 |
| 8 | 105202432 |
| 9 | 2607968768 |
| 10 | 59563461632 |
| 11 | 1280762398720 |
| 12 | 26305784328192 |
| 13 | 521325843259392 |
| 14 | 10041603365060608 |
| 15 | 189005928050491392 |
| 16 | 3490617343237881856 |
| 17 | 63453465548367724544 |
| 18 | 1138182144128359071744 |
| 19 | 20185020166145139277824 |
| 20 | 354486178810344080670720 |
[8,48,2592,113856,3777664,105202432,2607968768, 59563461632,1280762398720,26305784328192, 521325843259392,10041603365060608, 189005928050491392,3490617343237881856, 63453465548367724544,1138182144128359071744, 20185020166145139277824,354486178810344080670720] |