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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 1408 |
| 3 | 2165800 |
| 4 | 37333296 |
| 5 | 19384601600 |
| 6 | 69370076160 |
| 7 | 69370076160 |
| 8 | 56288711711232000 |
| 9 | 7917914554368000000 |
| 10 | 199449790781142859776 |
[8,1408,2165800,37333296,19384601600,69370076160, 69370076160,56288711711232000,7917914554368000000, 199449790781142859776] |