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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -7 |
| 3 | -74 |
| 4 | -902 |
| 5 | -14075 |
| 6 | -253551 |
| 7 | -5307194 |
| 8 | -124832925 |
| 9 | -3278747898 |
| 10 | -94780240390 |
| 11 | -2995303153545 |
| 12 | -102658540155454 |
| 13 | -3794631664471440 |
| 14 | -150460754913170964 |
| 15 | -6371573878247136298 |
| 16 | -287006135162339175131 |
| 17 | -13703650554585427586271 |
[1,-1,-7,-74,-902,-14075,-253551,-5307194, -124832925,-3278747898,-94780240390, -2995303153545,-102658540155454,-3794631664471440, -150460754913170964,-6371573878247136298, -287006135162339175131,-13703650554585427586271] |