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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 24 |
| 5 | 111920 |
| 6 | 2030271480 |
| 7 | 91358224634433 |
| 8 | 9350902053107858880 |
| 9 | 2018328183128437950016800 |
| 10 | 859819730886010540636567920000 |
| 11 | 682948436592331311886782349445512800 |
[0,0,0,24,111920,2030271480,91358224634433, 9350902053107858880,2018328183128437950016800, 859819730886010540636567920000, 682948436592331311886782349445512800] |