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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 2689 |
| 3 | 2189991 |
| 4 | 16776955943 |
| 5 | 1137726954093673 |
| 6 | 615510832230066725429 |
| 7 | 2693465102291782418303130499 |
[15,2689,2189991,16776955943,1137726954093673, 615510832230066725429, 2693465102291782418303130499] |