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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -4 |
| 3 | 42 |
| 4 | -736 |
| 5 | 18200 |
| 6 | -582624 |
| 7 | 22918672 |
| 8 | -1069947904 |
| 9 | 57826348416 |
| 10 | -3551472064000 |
| 11 | 244313618844416 |
| 12 | -18609923667234816 |
| 13 | 1554954961060953088 |
| 14 | -141407678375562489856 |
| 15 | 13904110871649987840000 |
[0,1,-4,42,-736,18200,-582624,22918672, -1069947904,57826348416,-3551472064000, 244313618844416,-18609923667234816, 1554954961060953088,-141407678375562489856, 13904110871649987840000] |