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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -13 |
| 3 | -87 |
| 4 | 2609 |
| 5 | 34965 |
| 6 | -1638841 |
| 7 | -33411007 |
| 8 | 2128380881 |
| 9 | 58501278297 |
| 10 | -4709853961605 |
| 11 | -163166745402375 |
| 12 | 15875893807564465 |
| 13 | 664163782026582877 |
| 14 | -75766955207796981345 |
| 15 | -3716140360596415682175 |
| 16 | 486265092408065178623265 |
| 17 | 27363821966293458296896305 |
| 18 | -4039473192629570940395992765 |
[1,1,-13,-87,2609,34965,-1638841,-33411007, 2128380881,58501278297,-4709853961605, -163166745402375,15875893807564465, 664163782026582877,-75766955207796981345, -3716140360596415682175,486265092408065178623265, 27363821966293458296896305, -4039473192629570940395992765] |