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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 396 |
| 3 | 588528 |
| 4 | 4087208000 |
| 5 | 97390176449400 |
| 6 | 6465177278417919600 |
| 7 | 1030450155933504769261568 |
| 8 | 352805275175791344554903371776 |
| 9 | 238031797291547406166218644352900000 |
| 10 | 295416986525310718941438520613968960376000 |
[0,2,396,588528,4087208000,97390176449400, 6465177278417919600,1030450155933504769261568, 352805275175791344554903371776, 238031797291547406166218644352900000, 295416986525310718941438520613968960376000] |