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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 7875 |
| 4 | 11142140625 |
| 5 | 467812950752090302734375 |
| 6 | 202822649430450649753225796950422853099588897705078125 |
[1,15,7875,11142140625,467812950752090302734375, 20282264943045064975322579695042285309958889770507\ 8125] |