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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 3 |
| 3 | 11 |
| 4 | 27 |
| 5 | 162 |
| 6 | 380 |
| 7 | 7650 |
| 8 | 17325 |
| 9 | 81340 |
| 10 | 2518992 |
| 11 | 91128240 |
| 12 | 424947600 |
| 13 | 14078156400 |
| 14 | 33300661680 |
| 15 | 424624548348 |
[3,3,11,27,162,380,7650,17325,81340,2518992, 91128240,424947600,14078156400,33300661680, 424624548348] |