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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | -4 |
| 3 | -176 |
| 4 | -1712 |
| 5 | 66912 |
| 6 | 4737344 |
| 7 | 53926656 |
| 8 | -18559434496 |
| 9 | -1869838374400 |
| 10 | 35429689535488 |
| 11 | 36301265658269696 |
| 12 | 4137398544580202496 |
| 13 | -569857298193726644224 |
| 14 | -297369786811582548131840 |
[1,2,-4,-176,-1712,66912,4737344,53926656, -18559434496,-1869838374400,35429689535488, 36301265658269696,4137398544580202496, -569857298193726644224,-297369786811582548131840] |