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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 40 |
| 2 | 718 |
| 3 | -41840 |
| 4 | -3573428 |
| 5 | 4674400 |
| 6 | 15945793480 |
| 7 | 613094814400 |
| 8 | -73925536369520 |
| 9 | -7283018465187200 |
| 10 | 295500169093761760 |
| 11 | 76056229626701574400 |
| 12 | 175306544520386380480 |
| 13 | -797966872588194008230400 |
| 14 | -33928739742998510567799680 |
| 15 | 8496145352999079190916992000 |
[1,40,718,-41840,-3573428,4674400,15945793480, 613094814400,-73925536369520,-7283018465187200, 295500169093761760,76056229626701574400, 175306544520386380480,-797966872588194008230400, -33928739742998510567799680, 8496145352999079190916992000] |