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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 56 |
| 9 | 2016 |
| 10 | 60480 |
| 11 | 1663200 |
| 12 | 43908480 |
| 13 | 1141620480 |
| 14 | 29682132480 |
| 15 | 779155977600 |
| 16 | 20777492736000 |
| 17 | 565147802419200 |
| 18 | 15721384321843200 |
| 19 | 448059453172531200 |
| 20 | 13097122477350912000 |
| 21 | 392913674320527360000 |
| 22 | 12101741169072242688000 |
[1,56,2016,60480,1663200,43908480,1141620480, 29682132480,779155977600,20777492736000, 565147802419200,15721384321843200, 448059453172531200,13097122477350912000, 392913674320527360000,12101741169072242688000] |