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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -5 |
| 3 | 51 |
| 4 | 1009 |
| 5 | -17765 |
| 6 | -636385 |
| 7 | 15875083 |
| 8 | 828730833 |
| 9 | -26734633497 |
| 10 | -1837389309405 |
| 11 | 72689703927555 |
| 12 | 6202163408816881 |
| 13 | -290609121018808813 |
| 14 | -29631450442239587305 |
| 15 | 1604436906627413556075 |
| 16 | 190333687041180914380065 |
| 17 | -11692931012450127257939505 |
| 18 | -1582217617564533519968758645 |
[1,-1,-5,51,1009,-17765,-636385,15875083, 828730833,-26734633497,-1837389309405, 72689703927555,6202163408816881, -290609121018808813,-29631450442239587305, 1604436906627413556075,190333687041180914380065, -11692931012450127257939505, -1582217617564533519968758645] |