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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 9 |
| 4 | 219 |
| 5 | 89 |
| 6 | 707 |
| 7 | 7139 |
| 8 | 17397 |
| 9 | 127107 |
| 10 | 185573 |
| 11 | 170099 |
| 12 | 8513673 |
| 13 | 3730629 |
| 14 | 9645947 |
| 15 | 20878187 |
| 16 | 435128997 |
| 17 | 413502597 |
| 18 | 7180622897 |
| 19 | 28071202809 |
| 20 | 4197184407 |
| 21 | 53159437779 |
| 22 | 72827487477 |
| 23 | 408466487673 |
| 24 | 1622948986427 |
| 25 | 1009480191957 |
| 26 | 50924645281527 |
| 27 | 141362538039039 |
[2,3,9,219,89,707,7139,17397,127107,185573,170099, 8513673,3730629,9645947,20878187,435128997, 413502597,7180622897,28071202809,4197184407, 53159437779,72827487477,408466487673, 1622948986427,1009480191957,50924645281527, 141362538039039] |