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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 144 |
| 4 | 2880 |
| 5 | 86400 |
| 6 | 3628800 |
| 7 | 203212800 |
| 8 | 14631321600 |
| 9 | 1316818944000 |
| 10 | 144850083840000 |
| 11 | 19120211066880000 |
| 12 | 2982752926433280000 |
| 13 | 542861032610856960000 |
| 14 | 114000816848279961600000 |
| 15 | 27360196043587190784000000 |
| 16 | 7441973323855715893248000000 |
[1,2,12,144,2880,86400,3628800,203212800, 14631321600,1316818944000,144850083840000, 19120211066880000,2982752926433280000, 542861032610856960000,114000816848279961600000, 27360196043587190784000000, 7441973323855715893248000000] |