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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 693 |
| 4 | 62985 |
| 5 | 9454725 |
| 6 | 2118331215 |
| 7 | 662496582825 |
| 8 | 275735605996305 |
| 9 | 147364622598587625 |
| 10 | 98358760729571316975 |
| 11 | 80185770642041047108125 |
| 12 | 78405694972326706112753625 |
| 13 | 90569612902695107431619494125 |
[1,15,693,62985,9454725,2118331215,662496582825, 275735605996305,147364622598587625, 98358760729571316975,80185770642041047108125, 78405694972326706112753625, 90569612902695107431619494125] |