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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 2 |
| 3 | -1 |
| 4 | -43 |
| 5 | 254 |
| 6 | 4157 |
| 7 | -70981 |
| 8 | -1310398 |
| 9 | 40933619 |
| 10 | 1087746617 |
| 11 | -43668096946 |
| 12 | -1926040182823 |
| 13 | 74089958942999 |
| 14 | 6019198050509282 |
| 15 | -160614025972447321 |
| 16 | -28821072878928603043 |
| 17 | 164386116957516330494 |
| 18 | 190177688405403480505877 |
| 19 | 5097857816569586800024019 |
[1,-1,2,-1,-43,254,4157,-70981,-1310398,40933619, 1087746617,-43668096946,-1926040182823, 74089958942999,6019198050509282, -160614025972447321,-28821072878928603043, 164386116957516330494,190177688405403480505877, 5097857816569586800024019] |