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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -2 |
| 3 | 7 |
| 4 | -24 |
| 5 | 165 |
| 6 | -1232 |
| 7 | 10827 |
| 8 | -111104 |
| 9 | 1316585 |
| 10 | -17449472 |
| 11 | 257028847 |
| 12 | -4164086784 |
| 13 | 73616009805 |
| 14 | -1409671718912 |
| 15 | 29070305745267 |
| 16 | -642304219480064 |
| 17 | 15137914082015825 |
| 18 | -379068532960919552 |
| 19 | 10050622525103392087 |
| 20 | -281286704647327186944 |
[0,1,-2,7,-24,165,-1232,10827,-111104,1316585, -17449472,257028847,-4164086784,73616009805, -1409671718912,29070305745267,-642304219480064, 15137914082015825,-379068532960919552, 10050622525103392087,-281286704647327186944] |