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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | -448 |
| 3 | -19171 |
| 4 | -258048 |
| 5 | -1920357 |
| 6 | -9815552 |
| 7 | -38256455 |
| 8 | -117440512 |
| 9 | -253202761 |
| 10 | 73741824 |
| 11 | 6231986901 |
| 12 | 63559696384 |
| 13 | 539151314515 |
| 14 | 4377385464320 |
| 15 | 35145928729457 |
| 16 | 281406257233920 |
| 17 | 2251681225808751 |
[1,7,-448,-19171,-258048,-1920357,-9815552, -38256455,-117440512,-253202761,73741824, 6231986901,63559696384,539151314515,4377385464320, 35145928729457,281406257233920,2251681225808751] |