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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 5 |
| 4 | 252 |
| 5 | 1328 |
| 6 | 227968 |
| 7 | 1520280 |
| 8 | 700078384 |
| 9 | 6124491248 |
| 10 | 5717789399488 |
| 11 | 61782464083584 |
| 12 | 102388058845620672 |
| 13 | 1317281759888482688 |
[1,3,5,252,1328,227968,1520280,700078384, 6124491248,5717789399488,61782464083584, 102388058845620672,1317281759888482688] |