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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -4 |
| 3 | 91 |
| 4 | -3004 |
| 5 | 204061 |
| 6 | -19378954 |
| 7 | 2719355731 |
| 8 | -504005966104 |
| 9 | 122050103412601 |
| 10 | -37013909750634454 |
| 11 | 13810412109218174671 |
| 12 | -6202801292273010744004 |
| 13 | 3304722240330810208121941 |
[0,1,-4,91,-3004,204061,-19378954,2719355731, -504005966104,122050103412601,-37013909750634454, 13810412109218174671,-6202801292273010744004, 3304722240330810208121941] |