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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 34 |
| 4 | 960 |
| 5 | 49500 |
| 6 | 3538080 |
| 7 | 404020145 |
| 8 | 73780761600 |
| 9 | 15590323138443 |
| 10 | 4627678068946516 |
| 11 | 1712182437990539536 |
| 12 | 709629581496779727567 |
| 13 | 434911027744132649793916 |
| 14 | 234745940945367262055489361 |
[1,3,34,960,49500,3538080,404020145,73780761600, 15590323138443,4627678068946516, 1712182437990539536,709629581496779727567, 434911027744132649793916, 234745940945367262055489361] |