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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 115 |
| 5 | 2086 |
| 6 | 101791 |
| 7 | 14835870 |
| 8 | 6852422567 |
| 9 | 10338780759514 |
| 10 | 51804974736769271 |
[1,1,3,14,115,2086,101791,14835870,6852422567, 10338780759514,51804974736769271] |