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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -3 |
| 3 | -30 |
| 4 | -256 |
| 5 | -7595 |
| 6 | -358301 |
| 7 | -7665804 |
| 8 | -227965955 |
| 9 | -13089461984 |
| 10 | -2467071630448 |
[1,1,-3,-30,-256,-7595,-358301,-7665804, -227965955,-13089461984,-2467071630448] |