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| n | a(n) |
|---|---|
| 10 | 362880 |
| 11 | 39916800 |
| 12 | 2874009600 |
| 13 | 175394419200 |
| 14 | 9967384627200 |
| 15 | 551675124000000 |
| 16 | 30471021291110400 |
| 17 | 1703458301210265600 |
| 18 | 97213825272736972800 |
| 19 | 5693251850259515942400 |
| 20 | 343266609438110040883200 |
| 21 | 21349182724237331665228800 |
| 22 | 1371132989012608561874534400 |
[362880,39916800,2874009600,175394419200, 9967384627200,551675124000000,30471021291110400, 1703458301210265600,97213825272736972800, 5693251850259515942400,343266609438110040883200, 21349182724237331665228800, 1371132989012608561874534400] |