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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 16 |
| 3 | 48 |
| 4 | -29696 |
| 5 | -6049792 |
| 6 | -1262426112 |
| 7 | -308569372672 |
| 8 | -89297625350144 |
| 9 | -30123113337716736 |
| 10 | -11520007513318621184 |
| 11 | -4775431672418431664128 |
| 12 | -1952929261585732032528384 |
| 13 | -545214673336986589066166272 |
[1,2,16,48,-29696,-6049792,-1262426112, -308569372672,-89297625350144,-30123113337716736, -11520007513318621184,-4775431672418431664128, -1952929261585732032528384, -545214673336986589066166272] |