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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 120 |
| 7 | 10920 |
| 8 | 988960 |
| 9 | 99706320 |
| 10 | 11897978400 |
| 11 | 1729153068720 |
| 12 | 306003079514880 |
| 13 | 64657337524631280 |
| 14 | 15890834362452489440 |
| 15 | 4435396700216405763840 |
| 16 | 1379778057502074926142720 |
| 17 | 471689356958791639787042560 |
[1,120,10920,988960,99706320,11897978400, 1729153068720,306003079514880,64657337524631280, 15890834362452489440,4435396700216405763840, 1379778057502074926142720, 471689356958791639787042560] |