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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 9 |
| 3 | 15 |
| 4 | 45 |
| 5 | 225 |
| 6 | 639 |
| 7 | 1275 |
| 8 | 4005 |
| 9 | 675405 |
| 10 | 2203959 |
| 11 | 3075159 |
| 12 | 6195234165 |
| 13 | 77989711185 |
| 14 | 4566262987329 |
[3,9,15,45,225,639,1275,4005,675405,2203959, 3075159,6195234165,77989711185,4566262987329] |