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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 915 |
| 3 | 6698715 |
| 4 | 717964529118315 |
| 5 | 16495138082306681918325119173515 |
| 6 | 17413733142679306233865281770975943513633443105435651232476307915 |
[15,915,6698715,717964529118315, 16495138082306681918325119173515, 17413733142679306233865281770975943513633443105435\ 651232476307915] |