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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 25 |
| 4 | 39 |
| 5 | 1075 |
| 6 | 2875 |
| 7 | 93025 |
| 8 | 548125 |
| 9 | 1716775 |
| 10 | 60231365 |
| 11 | 9509852725 |
| 12 | 111429831875 |
[1,3,25,39,1075,2875,93025,548125,1716775, 60231365,9509852725,111429831875] |