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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 116288545977326780410953600 |
| 3 | 581442729886633902054768000 |
| 4 | 7093601304616933605068169600 |
| 5 | 35468006523084668025340848000 |
| 6 | 475271287409334551539567363200 |
| 7 | 2376356437046672757697836816000 |
| 8 | 168721307030313765796546413936000 |
| 9 | 1855934377333451423762010553296000 |
[2,116288545977326780410953600, 581442729886633902054768000, 7093601304616933605068169600, 35468006523084668025340848000, 475271287409334551539567363200, 2376356437046672757697836816000, 168721307030313765796546413936000, 1855934377333451423762010553296000] |