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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 2129 |
| 3 | 2064527 |
| 4 | 16237318767 |
| 5 | 1024215443152687 |
| 6 | 515298827433540888151 |
| 7 | 2068734726208811311397436981 |
| 8 | 66293423431894237647538826697163203 |
[15,2129,2064527,16237318767,1024215443152687, 515298827433540888151, 2068734726208811311397436981, 66293423431894237647538826697163203] |