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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | -4 |
| 2 | 38 |
| 3 | -264 |
| 4 | 9162 |
| 5 | 6423540 |
| 6 | -875983890 |
| 7 | 380802735600 |
| 8 | -91040517107310 |
| 9 | 46795149700613100 |
| 10 | -17544576509662829130 |
| 11 | 11815590123153714787560 |
| 12 | -6408554682643734028619430 |
| 13 | 5614434324236056272171194340 |
[2,-4,38,-264,9162,6423540,-875983890, 380802735600,-91040517107310,46795149700613100, -17544576509662829130,11815590123153714787560, -6408554682643734028619430, 5614434324236056272171194340] |