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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | -3 |
| 4 | 12 |
| 5 | 10 |
| 6 | -660 |
| 7 | 5600 |
| 8 | 8400 |
| 9 | -951660 |
| 10 | 12715200 |
| 11 | 21635900 |
| 12 | -4308744000 |
| 13 | 80314007800 |
| 14 | 115204471200 |
| 15 | -44501789202000 |
| 16 | 1083368456352000 |
| 17 | 782537744170000 |
| 18 | -876176569052928000 |
| 19 | 26724653123017850000 |
| 20 | -10930955906482560000 |
| 21 | -29304692085200613900000 |
| 22 | 1088420125090964265600000 |
[1,1,0,-3,12,10,-660,5600,8400,-951660,12715200, 21635900,-4308744000,80314007800,115204471200, -44501789202000,1083368456352000,782537744170000, -876176569052928000,26724653123017850000, -10930955906482560000,-29304692085200613900000, 1088420125090964265600000] |