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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 288 |
| 3 | 98496 |
| 4 | 236390400 |
| 5 | 3972777062400 |
| 6 | 467389275837235200 |
| 7 | 384914699001548351078400 |
| 8 | 2218956256804125934296760320000 |
| 9 | 89542886518308517126993353029713920000 |
[1,6,288,98496,236390400,3972777062400, 467389275837235200,384914699001548351078400, 2218956256804125934296760320000, 89542886518308517126993353029713920000] |