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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -3 |
| 3 | -24 |
| 4 | -216 |
| 5 | -2801 |
| 6 | -42166 |
| 7 | -762397 |
| 8 | -15685040 |
| 9 | -366477168 |
| 10 | -9523974486 |
| 11 | -273453483050 |
| 12 | -8583651341879 |
| 13 | -292700900034984 |
| 14 | -10770969729108326 |
| 15 | -425541512224476567 |
| 16 | -17964544188354355022 |
| 17 | -807097409926675847400 |
[1,-1,-3,-24,-216,-2801,-42166,-762397,-15685040, -366477168,-9523974486,-273453483050, -8583651341879,-292700900034984, -10770969729108326,-425541512224476567, -17964544188354355022,-807097409926675847400] |