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| n | a(n) |
|---|---|
| 4 | 2 |
| 5 | 14 |
| 6 | 89 |
| 7 | 629 |
| 8 | 5039 |
| 9 | 45359 |
| 10 | 453599 |
| 11 | 4989599 |
| 12 | 59875199 |
| 13 | 778377599 |
| 14 | 10897286399 |
| 15 | 163459295999 |
| 16 | 2615348735999 |
| 17 | 44460928511999 |
| 18 | 800296713215999 |
| 19 | 15205637551103999 |
| 20 | 304112751022079999 |
[2,14,89,629,5039,45359,453599,4989599,59875199, 778377599,10897286399,163459295999,2615348735999, 44460928511999,800296713215999,15205637551103999, 304112751022079999] |