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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 36 |
| 4 | 17280 |
| 5 | 435456000 |
| 6 | 941525544960000 |
| 7 | 257498348545415577600000 |
| 8 | 12293098054744302855420641280000000 |
| 9 | 134988938425519353794787639744975077376000000000 |
| 10 | 434085115076654530026451920435442716425635693068288000000000000 |
[1,2,36,17280,435456000,941525544960000, 257498348545415577600000, 12293098054744302855420641280000000, 134988938425519353794787639744975077376000000000, 43408511507665453002645192043544271642563569306828\ 8000000000000] |