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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 77 |
| 4 | 2100 |
| 5 | 122694 |
| 6 | 15459444 |
| 7 | 4220448492 |
| 8 | 2504511958416 |
| 9 | 3237984252258520 |
| 10 | 9135209892155631900 |
| 11 | 56307395363835925220625 |
| 12 | 758909821892432106622050000 |
| 13 | 22380517337924566377547475850000 |
| 14 | 1444814401119843300312851440909560000 |
| 15 | 204254167807759030850057485271236254820800 |
[1,6,77,2100,122694,15459444,4220448492, 2504511958416,3237984252258520, 9135209892155631900,56307395363835925220625, 758909821892432106622050000, 22380517337924566377547475850000, 1444814401119843300312851440909560000, 204254167807759030850057485271236254820800] |