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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 170 |
| 3 | 8353 |
| 4 | 382690 |
| 5 | 19210586 |
| 6 | 1063706501 |
| 7 | 63085436203 |
| 8 | 3958922741466 |
| 9 | 259024497472292 |
| 10 | 17435614748138060 |
[15,170,8353,382690,19210586,1063706501, 63085436203,3958922741466,259024497472292, 17435614748138060] |