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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 12 |
| 3 | 181440 |
| 4 | 10461394944000 |
| 5 | 7755605021665492992000000 |
| 6 | 185996663394950608733999724075417600000000 |
| 7 | 304140932017133780436126081660647688443776415689605120000000000 |
| 8 | 63443466092942082051716694667580740401432758087272596099400947187607352115200000000000000 |
[1,12,181440,10461394944000, 7755605021665492992000000, 185996663394950608733999724075417600000000, 30414093201713378043612608166064768844377641568960\ 5120000000000, 63443466092942082051716694667580740401432758087272\ 596099400947187607352115200000000000000] |