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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 189 |
| 4 | 157984 |
| 5 | 514790020 |
| 6 | 5334492792240 |
| 7 | 150603715387867113 |
| 8 | 10301508972326640532800 |
| 9 | 1555479697698632517004275840 |
| 10 | 480593112323971829410256539190400 |
[0,2,189,157984,514790020,5334492792240, 150603715387867113,10301508972326640532800, 1555479697698632517004275840, 480593112323971829410256539190400] |