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| n | a(n) |
|---|---|
| 1 | -1 |
| 2 | 4 |
| 3 | 104 |
| 4 | 1408 |
| 5 | 354944 |
| 6 | -21642752 |
| 7 | 6204652544 |
| 8 | 68669145088 |
| 9 | 47215125069824 |
| 10 | -78465506362130432 |
| 11 | 51085990673656315904 |
| 12 | -6994033618612756938752 |
| 13 | 15510963121850795776016384 |
| 14 | -7220202338641080038690127872 |
| 15 | -7469518701197092988127633473536 |
| 16 | 11962377309169877924807975108608 |
[-1,4,104,1408,354944,-21642752,6204652544, 68669145088,47215125069824,-78465506362130432, 51085990673656315904,-6994033618612756938752, 15510963121850795776016384, -7220202338641080038690127872, -7469518701197092988127633473536, 11962377309169877924807975108608] |