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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 39 |
| 4 | 437 |
| 5 | 8925 |
| 6 | 305779 |
| 7 | 18569865 |
| 8 | 1972604754 |
| 9 | 365315073334 |
| 10 | 118431758924590 |
[1,7,39,437,8925,305779,18569865,1972604754, 365315073334,118431758924590] |