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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 117 |
| 4 | 3792 |
| 5 | 172005 |
| 6 | 10030248 |
| 7 | 714843885 |
| 8 | 60207412128 |
| 9 | 5850995291397 |
| 10 | 644410711219800 |
| 11 | 79322681596610661 |
| 12 | 10791841135527454896 |
| 13 | 1608054016025580893445 |
| 14 | 260445389091217967677992 |
| 15 | 45557042043723212142506205 |
| 16 | 8559094926999510089793332544 |
| 17 | 1718950045690606262911636792677 |
[1,6,117,3792,172005,10030248,714843885, 60207412128,5850995291397,644410711219800, 79322681596610661,10791841135527454896, 1608054016025580893445,260445389091217967677992, 45557042043723212142506205, 8559094926999510089793332544, 1718950045690606262911636792677] |