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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 17 |
| 5 | 49 |
| 6 | 205 |
| 7 | 2349 |
| 8 | 61265 |
| 9 | 1411269 |
| 10 | 32593981 |
| 11 | 1645382827 |
| 12 | 152924199125 |
[1,1,1,17,49,205,2349,61265,1411269,32593981, 1645382827,152924199125] |