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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -2 |
| 3 | -12 |
| 4 | -424 |
| 5 | -29808 |
| 6 | -2966816 |
| 7 | -237449920 |
| 8 | 76118167936 |
| 9 | 84317834342656 |
| 10 | 53499781544238592 |
| 11 | 20080969948883956736 |
| 12 | -10740526073453596649472 |
| 13 | -31099457241702481710116864 |
[1,-2,-12,-424,-29808,-2966816,-237449920, 76118167936,84317834342656,53499781544238592, 20080969948883956736,-10740526073453596649472, -31099457241702481710116864] |