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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | 8 |
| 5 | 12 |
| 6 | 72 |
| 7 | 144 |
| 8 | 1152 |
| 9 | 2880 |
| 10 | 28800 |
| 11 | 86400 |
| 12 | 1036800 |
| 13 | 3628800 |
| 14 | 50803200 |
| 15 | 203212800 |
| 16 | 3251404800 |
| 17 | 14631321600 |
| 18 | 263363788800 |
| 19 | 1316818944000 |
| 20 | 26336378880000 |
| 21 | 144850083840000 |
| 22 | 3186701844480000 |
| 23 | 19120211066880000 |
| 24 | 458885065605120000 |
| 25 | 2982752926433280000 |
[2,1,2,2,8,12,72,144,1152,2880,28800,86400, 1036800,3628800,50803200,203212800,3251404800, 14631321600,263363788800,1316818944000, 26336378880000,144850083840000,3186701844480000, 19120211066880000,458885065605120000, 2982752926433280000] |