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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | -8 |
| 4 | -80 |
| 5 | 1576 |
| 6 | 43056 |
| 7 | -4001376 |
| 8 | -539274240 |
| 9 | 230311875456 |
| 10 | 169101315797760 |
| 11 | -333305191377561600 |
| 12 | -1205460382028665927680 |
| 13 | 11038562078873652773729280 |
| 14 | 187384458453666330945406187520 |
| 15 | -7882186562442515869956999642009600 |
[0,1,2,-8,-80,1576,43056,-4001376,-539274240, 230311875456,169101315797760,-333305191377561600, -1205460382028665927680, 11038562078873652773729280, 187384458453666330945406187520, -7882186562442515869956999642009600] |