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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 13 |
| 3 | -325 |
| 4 | 14873 |
| 5 | -1157705 |
| 6 | 123919013 |
| 7 | -19431568013 |
| 8 | 3783114987057 |
| 9 | -997881588156817 |
| 10 | 307028543021467965 |
| 11 | -122601833964174456533 |
| 12 | 54600351690827520350281 |
| 13 | -30810847280896713474456025 |
[1,-1,13,-325,14873,-1157705,123919013, -19431568013,3783114987057,-997881588156817, 307028543021467965,-122601833964174456533, 54600351690827520350281, -30810847280896713474456025] |