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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 9 |
| 2 | 24 |
| 3 | 45 |
| 4 | 72 |
| 5 | 105 |
| 6 | 144 |
| 7 | 189 |
| 8 | 240 |
| 9 | 297 |
| 10 | 360 |
| 11 | 429 |
| 12 | 504 |
| 13 | 585 |
| 14 | 672 |
| 15 | 765 |
| 16 | 864 |
| 17 | 969 |
| 18 | 1080 |
[0,9,24,45,72,105,144,189,240,297,360,429,504,585, 672,765,864,969,1080] |