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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 84 |
| 4 | 273000 |
| 5 | 3046699656000 |
| 6 | 5996663814749677445376000 |
| 7 | 160771799453017261771769947549079938007040000 |
| 8 | 6351968589735888467306807912855132014808202373395298410963148996608000000 |
[1,3,84,273000,3046699656000, 5996663814749677445376000, 160771799453017261771769947549079938007040000, 63519685897358884673068079128551320148082023733952\ 98410963148996608000000] |