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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 32 |
| 4 | 350 |
| 5 | 8712 |
| 6 | 526848 |
| 7 | 80289792 |
| 8 | 31428168318 |
| 9 | 31906468445000 |
| 10 | 84447578671097576 |
| 11 | 584524457418427932672 |
| 12 | 10604795873304968964262400 |
| 13 | 505245441738743508813986275328 |
| 14 | 63320582170435750241601032951040000 |
| 15 | 20908669294849228879861552351685432573952 |
[1,2,6,32,350,8712,526848,80289792,31428168318, 31906468445000,84447578671097576, 584524457418427932672,10604795873304968964262400, 505245441738743508813986275328, 63320582170435750241601032951040000, 20908669294849228879861552351685432573952] |