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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 9 |
| 3 | -153 |
| 4 | 4273 |
| 5 | -177489 |
| 6 | 10342137 |
| 7 | -800697641 |
| 8 | 78896218081 |
| 9 | -9587206592289 |
| 10 | 1403875965476969 |
| 11 | -243412313149166137 |
| 12 | 49273184499900888465 |
| 13 | -11506634193913551650161 |
| 14 | 3067851166645384439929945 |
[1,-1,9,-153,4273,-177489,10342137,-800697641, 78896218081,-9587206592289,1403875965476969, -243412313149166137,49273184499900888465, -11506634193913551650161, 3067851166645384439929945] |