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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -4 |
| 3 | 46 |
| 4 | -1056 |
| 5 | 40536 |
| 6 | -2342880 |
| 7 | 190229040 |
| 8 | -20655129600 |
| 9 | 2890827273600 |
| 10 | -506836099929600 |
| 11 | 108811461852576000 |
| 12 | -28078128329061888000 |
| 13 | 8574915159297970560000 |
| 14 | -3059025135601894018560000 |
| 15 | 1260573112806548772591360000 |
| 16 | -594261372327243392714342400000 |
[0,1,-4,46,-1056,40536,-2342880,190229040, -20655129600,2890827273600,-506836099929600, 108811461852576000,-28078128329061888000, 8574915159297970560000,-3059025135601894018560000, 1260573112806548772591360000, -594261372327243392714342400000] |