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| n | a(n) |
|---|---|
| 7 | 720 |
| 8 | 17640 |
| 9 | 258720 |
| 10 | 2963520 |
| 11 | 29317680 |
| 12 | 263506320 |
| 13 | 2215825920 |
| 14 | 17758540440 |
| 15 | 137337087888 |
| 16 | 1033793011440 |
| 17 | 7621696948320 |
| 18 | 55289495222640 |
| 19 | 396017903136240 |
| 20 | 2808175618022544 |
| 21 | 19754629731587280 |
| 22 | 138087381577881960 |
| 23 | 960370246763096400 |
| 24 | 6652267408747194360 |
[720,17640,258720,2963520,29317680,263506320, 2215825920,17758540440,137337087888,1033793011440, 7621696948320,55289495222640,396017903136240, 2808175618022544,19754629731587280, 138087381577881960,960370246763096400, 6652267408747194360] |