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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 33 |
| 3 | 311 |
| 4 | 1311 |
| 5 | 2357 |
| 6 | 12357 |
| 7 | 91373 |
| 8 | 191373 |
| 9 | 273701 |
| 10 | 594639 |
| 11 | 966071 |
| 12 | 3792549 |
| 13 | 7714919 |
| 14 | 18474177 |
| 15 | 36158059 |
| 16 | 217166627 |
| 17 | 415296747 |
| 18 | 1269327263 |
| 19 | 8581147923 |
| 20 | 85531003291 |
| 21 | 307572780863 |
| 22 | 417501775143 |
| 23 | 594709702027 |
| 24 | 1334471501519 |
[9,33,311,1311,2357,12357,91373,191373,273701, 594639,966071,3792549,7714919,18474177,36158059, 217166627,415296747,1269327263,8581147923, 85531003291,307572780863,417501775143, 594709702027,1334471501519] |