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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 15 |
| 4 | 316 |
| 5 | 16885 |
| 6 | 2174586 |
| 7 | 654313415 |
| 8 | 450179768312 |
| 9 | 696979588034313 |
| 10 | 2398044825254021110 |
| 11 | 18151895792052235541515 |
| 12 | 299782788128536523836784628 |
| 13 | 10727139906233315197412684689421 |
[1,2,15,316,16885,2174586,654313415,450179768312, 696979588034313,2398044825254021110, 18151895792052235541515, 299782788128536523836784628, 10727139906233315197412684689421] |