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| n | a(n) |
|---|---|
| -1 | 1 |
| 0 | 3 |
| 1 | 45 |
| 2 | 945 |
| 3 | 4725 |
| 4 | 93555 |
| 5 | 638512875 |
| 6 | 18243225 |
| 7 | 162820783125 |
| 8 | 38979295480125 |
| 9 | 1531329465290625 |
| 10 | 13447856940643125 |
| 11 | 201919571963756521875 |
| 12 | 11094481976030578125 |
| 13 | 564653660170076273671875 |
| 14 | 5660878804669082674070015625 |
| 15 | 31245110285511170603633203125 |
[1,3,45,945,4725,93555,638512875,18243225, 162820783125,38979295480125,1531329465290625, 13447856940643125,201919571963756521875, 11094481976030578125,564653660170076273671875, 5660878804669082674070015625, 31245110285511170603633203125] |