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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | -3 |
| 4 | -15 |
| 5 | 41 |
| 6 | 561 |
| 7 | -1019 |
| 8 | -38623 |
| 9 | 12305 |
| 10 | 4206881 |
| 11 | 7478221 |
| 12 | -661302639 |
| 13 | -3005647943 |
| 14 | 140958927825 |
| 15 | 1143787246421 |
| 16 | -38921417469119 |
| 17 | -494108406644959 |
| 18 | 13433349471318337 |
| 19 | 250135591701350045 |
[1,1,1,-3,-15,41,561,-1019,-38623,12305,4206881, 7478221,-661302639,-3005647943,140958927825, 1143787246421,-38921417469119,-494108406644959, 13433349471318337,250135591701350045] |