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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 28 |
| 3 | 36 |
| 4 | 54 |
| 5 | 90 |
| 6 | 108 |
| 7 | 135 |
| 8 | 154 |
| 9 | 181 |
| 10 | 207 |
| 11 | 225 |
| 12 | 234 |
| 13 | 307 |
| 14 | 360 |
| 15 | 388 |
| 16 | 469 |
| 17 | 523 |
| 18 | 540 |
| 19 | 685 |
| 20 | 720 |
[1,9,28,36,54,90,108,135,154,181,207,225,234,307, 360,388,469,523,540,685,720] |