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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 9 |
| 2 | 27 |
| 3 | 81 |
| 4 | 225 |
| 5 | 507 |
| 6 | 912 |
| 7 | 1236 |
| 8 | 1587 |
| 9 | 1782 |
| 10 | 1977 |
| 11 | 2046 |
| 12 | 2070 |
| 13 | 1947 |
| 14 | 1680 |
| 15 | 1275 |
| 16 | 951 |
| 17 | 600 |
| 18 | 402 |
| 19 | 201 |
| 20 | 114 |
| 21 | 36 |
| 22 | 15 |
[3,9,27,81,225,507,912,1236,1587,1782,1977,2046, 2070,1947,1680,1275,951,600,402,201,114,36,15] |