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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 1440 |
| 3 | 1194264 |
| 4 | 541478400 |
| 5 | 312591006756 |
| 6 | 162166557492864 |
| 7 | 88044200553447984 |
| 8 | 46868779675750146048 |
| 9 | 25162028756680583497806 |
| 10 | 13459244040350535046357440 |
| 11 | 7210731049497803400061471560 |
| 12 | 3860497513211463446882383706112 |
[6,1440,1194264,541478400,312591006756, 162166557492864,88044200553447984, 46868779675750146048,25162028756680583497806, 13459244040350535046357440, 7210731049497803400061471560, 3860497513211463446882383706112] |