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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 38 |
| 5 | 470 |
| 6 | 8287 |
| 7 | 289052 |
| 8 | 18346083 |
| 9 | 2073906873 |
| 10 | 428208650284 |
[1,2,8,38,470,8287,289052,18346083,2073906873, 428208650284] |