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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -2 |
| 3 | 4 |
| 4 | -17 |
| 5 | 93 |
| 6 | -649 |
| 7 | 5381 |
| 8 | -51778 |
| 9 | 565957 |
| 10 | -6930141 |
| 11 | 93992413 |
| 12 | -1399244076 |
| 13 | 22689478823 |
| 14 | -398164266655 |
| 15 | 7519118564551 |
| 16 | -152058873978384 |
| 17 | 3278894568674073 |
| 18 | -75103386737309385 |
| 19 | 1821102601528126265 |
[0,1,-2,4,-17,93,-649,5381,-51778,565957,-6930141, 93992413,-1399244076,22689478823,-398164266655, 7519118564551,-152058873978384,3278894568674073, -75103386737309385,1821102601528126265] |