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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 8 |
| 3 | 264 |
| 4 | 121200 |
| 5 | 332810400 |
| 6 | 7753173594200 |
| 7 | 1440193875113407680 |
| 8 | 2250630808138439243100640 |
| 9 | 29565964235758317208187044137600 |
| 10 | 3307988125501026209547184198622507128848 |
| 11 | 3165738749695300492286911657015518806826344524560 |
[1,0,8,264,121200,332810400,7753173594200, 1440193875113407680,2250630808138439243100640, 29565964235758317208187044137600, 3307988125501026209547184198622507128848, 3165738749695300492286911657015518806826344524560] |