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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | 16 |
| 3 | -328 |
| 4 | 12160 |
| 5 | -721280 |
| 6 | 62638720 |
| 7 | -7495723264 |
| 8 | 1182630301696 |
| 9 | -237887012458496 |
| 10 | 59422015832915968 |
| 11 | -18045969534514167808 |
| 12 | 6548012482760106213376 |
| 13 | -2797775464269494922051584 |
[1,-2,16,-328,12160,-721280,62638720,-7495723264, 1182630301696,-237887012458496,59422015832915968, -18045969534514167808,6548012482760106213376, -2797775464269494922051584] |