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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 15 |
| 2 | 525 |
| 3 | 1414875 |
| 4 | 41985913344375 |
| 5 | 433555011900329243987584396875 |
| 6 | 3514495551481947615680580256869117013417604971088496013610671875 |
[3,15,525,1414875,41985913344375, 433555011900329243987584396875, 35144955514819476156805802568691170134176049710884\ 96013610671875] |