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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 116 |
| 3 | 1928 |
| 4 | 27665 |
| 5 | 364472 |
| 6 | 4547586 |
| 7 | 54670463 |
| 8 | 639838113 |
| 9 | 7338610159 |
| 10 | 82857366967 |
[1,6,116,1928,27665,364472,4547586,54670463, 639838113,7338610159,82857366967] |