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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 13 |
| 3 | -373 |
| 4 | 19097 |
| 5 | -1522409 |
| 6 | 174263717 |
| 7 | -27072485469 |
| 8 | 5477315064625 |
| 9 | -1398343023229393 |
| 10 | 439386703590146365 |
| 11 | -166541598232670049093 |
| 12 | 74891796652158938855881 |
| 13 | -39404384075265527597485241 |
[1,-1,13,-373,19097,-1522409,174263717, -27072485469,5477315064625,-1398343023229393, 439386703590146365,-166541598232670049093, 74891796652158938855881, -39404384075265527597485241] |