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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -1 |
| 3 | 3 |
| 4 | -10 |
| 5 | 41 |
| 6 | -232 |
| 7 | 1299 |
| 8 | -10064 |
| 9 | 74609 |
| 10 | -720384 |
| 11 | 6787811 |
| 12 | -78009600 |
| 13 | 898506649 |
| 14 | -11977120768 |
| 15 | 163241051315 |
| 16 | -2480763381760 |
| 17 | 39007280136801 |
| 18 | -666957211828224 |
| 19 | 11866656488375747 |
| 20 | -225809770695098368 |
[0,1,-1,3,-10,41,-232,1299,-10064,74609,-720384, 6787811,-78009600,898506649,-11977120768, 163241051315,-2480763381760,39007280136801, -666957211828224,11866656488375747, -225809770695098368] |