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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | 82 |
| 5 | 210 |
| 6 | 24604 |
| 7 | 157700 |
| 8 | 153363108 |
| 9 | 4197081428 |
| 10 | 19984585910224 |
[1,2,2,82,210,24604,157700,153363108,4197081428, 19984585910224] |