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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -1 |
| 3 | -7 |
| 4 | 19 |
| 5 | 229 |
| 6 | -1009 |
| 7 | -17263 |
| 8 | 105211 |
| 9 | 2332141 |
| 10 | -18148681 |
| 11 | -494079367 |
| 12 | 4678377859 |
| 13 | 151026527989 |
| 14 | -1684778524129 |
| 15 | -62909200846303 |
| 16 | 807879476432971 |
| 17 | 34252260613710781 |
| 18 | -497629527847938361 |
| 19 | -23615390533271153527 |
| 20 | 382915997208515638099 |
| 21 | 20108383384185058286149 |
[1,1,-1,-7,19,229,-1009,-17263,105211,2332141, -18148681,-494079367,4678377859,151026527989, -1684778524129,-62909200846303,807879476432971, 34252260613710781,-497629527847938361, -23615390533271153527,382915997208515638099, 20108383384185058286149] |