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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | -44 |
| 3 | -944 |
| 4 | -27632 |
| 5 | -975072 |
| 6 | -27882048 |
| 7 | 1986004224 |
| 8 | 850359527680 |
| 9 | 222801125934592 |
| 10 | 57863671042155520 |
| 11 | 16141663294163980288 |
| 12 | 4939136307747239694336 |
| 13 | 1663039626931665431732224 |
[1,-2,-44,-944,-27632,-975072,-27882048, 1986004224,850359527680,222801125934592, 57863671042155520,16141663294163980288, 4939136307747239694336,1663039626931665431732224] |