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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -7 |
| 2 | 13 |
| 3 | 63 |
| 4 | -4921 |
| 5 | -3675 |
| 6 | 703333 |
| 7 | 465087 |
| 8 | -88109041 |
| 9 | -102157335 |
| 10 | 4885044115 |
| 11 | 34400733171 |
| 12 | -900319230753451 |
| 13 | -16443210270435 |
| 14 | 1104102066969811 |
| 15 | 10582751251882215 |
| 16 | -69039327471471640577 |
| 17 | -8822362044750128175 |
| 18 | 101317434249311050977631 |
[1,-7,13,63,-4921,-3675,703333,465087,-88109041, -102157335,4885044115,34400733171, -900319230753451,-16443210270435,1104102066969811, 10582751251882215,-69039327471471640577, -8822362044750128175,101317434249311050977631] |