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| n | a(n) |
|---|---|
| 10 | 3628800 |
| 11 | 19958400 |
| 12 | 139708800 |
| 13 | 752431680 |
| 14 | 4239995760 |
| 15 | 21789167400 |
| 16 | 114909631200 |
| 17 | 584574333840 |
| 18 | 3027714547410 |
| 19 | 15487149249315 |
| 20 | 80380034496675 |
| 21 | 416678817402540 |
| 22 | 2188661321134365 |
| 23 | 11547842522164410 |
| 24 | 61697603618819175 |
| 25 | 332093455309359975 |
| 26 | 1809348373235738090 |
[3628800,19958400,139708800,752431680,4239995760, 21789167400,114909631200,584574333840, 3027714547410,15487149249315,80380034496675, 416678817402540,2188661321134365, 11547842522164410,61697603618819175, 332093455309359975,1809348373235738090] |