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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -720 |
| 2 | 269280 |
| 3 | -107765856 |
| 4 | 44184000960 |
| 5 | -18343724398560 |
| 6 | 7674347243833920 |
| 7 | -3227358183233849280 |
| 8 | 1362313994259911121792 |
| 9 | -576679534187816788835040 |
| 10 | 244653763082978694519455040 |
| 11 | -103977849310265945170768392000 |
| 12 | 44255109760585207541022458448000 |
| 13 | -18858872473375780341531310443030720 |
[1,-720,269280,-107765856,44184000960, -18343724398560,7674347243833920, -3227358183233849280,1362313994259911121792, -576679534187816788835040, 244653763082978694519455040, -103977849310265945170768392000, 44255109760585207541022458448000, -18858872473375780341531310443030720] |