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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -3 |
| 3 | 52 |
| 4 | -1596 |
| 5 | 68174 |
| 6 | -3679964 |
| 7 | 238949640 |
| 8 | -18133397519 |
| 9 | 1578639190316 |
| 10 | -155623090726884 |
| 11 | 17203681850199360 |
| 12 | -2116171636238243028 |
| 13 | 287762930191296817296 |
| 14 | -43014624174283817327952 |
| 15 | 7032470676704382424751408 |
| 16 | -1251802142595596587066746328 |
| 17 | 241602713767787669715442097616 |
| 18 | -50368862903110844612768593045136 |
| 19 | 11303387910446267256159298807620472 |
[1,-3,52,-1596,68174,-3679964,238949640, -18133397519,1578639190316,-155623090726884, 17203681850199360,-2116171636238243028, 287762930191296817296,-43014624174283817327952, 7032470676704382424751408, -1251802142595596587066746328, 241602713767787669715442097616, -50368862903110844612768593045136, 11303387910446267256159298807620472] |