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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | -1 |
| 2 | 43 |
| 3 | -1215 |
| 4 | 28445 |
| 5 | -597638 |
| 6 | 11700450 |
| 7 | -217941042 |
| 8 | 3911918070 |
| 9 | -68234265135 |
| 10 | 1163342929477 |
| 11 | -19468544310649 |
| 12 | 320806889772075 |
| 13 | -5217751119317660 |
| 14 | 83921044722457460 |
| 15 | -1336777733583083700 |
| 16 | 21114347188610320476 |
| 17 | -331025419358450069613 |
| 18 | 5155517342468313436815 |
| 19 | -79820563217794780940035 |
[0,-1,43,-1215,28445,-597638,11700450,-217941042, 3911918070,-68234265135,1163342929477, -19468544310649,320806889772075,-5217751119317660, 83921044722457460,-1336777733583083700, 21114347188610320476,-331025419358450069613, 5155517342468313436815,-79820563217794780940035] |