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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -6 |
| 2 | 72 |
| 3 | -1848 |
| 4 | 81088 |
| 5 | -5318016 |
| 6 | 483162240 |
| 7 | -57865303296 |
| 8 | 8815813734400 |
| 9 | -1662921003208704 |
| 10 | 380141599264751616 |
| 11 | -103492751953073897472 |
| 12 | 33072262407957372633088 |
| 13 | -12253967233389523820544000 |
[1,-6,72,-1848,81088,-5318016,483162240, -57865303296,8815813734400,-1662921003208704, 380141599264751616,-103492751953073897472, 33072262407957372633088, -12253967233389523820544000] |