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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 19 |
| 5 | 21 |
| 6 | 57 |
| 7 | 73 |
| 8 | 81 |
| 9 | 207 |
| 10 | 349 |
| 11 | 421 |
| 12 | 3811 |
| 13 | 3981 |
| 14 | 20923 |
| 15 | 23785 |
| 16 | 38851 |
| 17 | 56041 |
| 18 | 68503 |
| 19 | 74433 |
[1,3,9,19,21,57,73,81,207,349,421,3811,3981,20923, 23785,38851,56041,68503,74433] |