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| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 3 |
| 5 | -42 |
| 6 | -405 |
| 7 | -1323 |
| 8 | 16191 |
| 9 | 281988 |
| 10 | 727461 |
| 11 | -36031905 |
| 12 | -321785541 |
| 13 | 9096860682 |
| 14 | 56853444375 |
| 15 | -8962986022263 |
| 16 | -13232013758145 |
| 17 | 15769350673346088 |
| 18 | 19995773274813609 |
| 19 | -41763484786911535557 |
| 20 | -53804630387174415021 |
| 21 | 167207293958593159129950 |
| 22 | 195185179930635360950211 |
[-1,0,1,3,3,-42,-405,-1323,16191,281988,727461, -36031905,-321785541,9096860682,56853444375, -8962986022263,-13232013758145,15769350673346088, 19995773274813609,-41763484786911535557, -53804630387174415021,167207293958593159129950, 195185179930635360950211] |