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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | -16 |
| 3 | 212 |
| 4 | -3400 |
| 5 | 60384 |
| 6 | -1142960 |
| 7 | 22598832 |
| 8 | -461250208 |
| 9 | 9644611008 |
| 10 | -205537131008 |
| 11 | 4447969973888 |
| 12 | -97482797466624 |
| 13 | 2159242220999936 |
| 14 | -48260706692535552 |
| 15 | 1087076798266594048 |
| 16 | -24652590023639251456 |
| 17 | 562396337623786449920 |
[1,2,-16,212,-3400,60384,-1142960,22598832, -461250208,9644611008,-205537131008,4447969973888, -97482797466624,2159242220999936, -48260706692535552,1087076798266594048, -24652590023639251456,562396337623786449920] |