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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 1 |
| 3 | 53 |
| 4 | -215 |
| 5 | 3341 |
| 6 | 199159 |
| 7 | 391337 |
| 8 | -4128623 |
| 9 | 710371933 |
| 10 | 257347648013 |
| 11 | 6178130243 |
| 12 | -111384981593 |
| 13 | 225570264096917 |
| 14 | 1407269115959761 |
| 15 | 1546226961439379 |
| 16 | 69849267671401979 |
| 17 | 5665951032145572087083 |
| 18 | 467410556088873329284747 |
| 19 | -1602619428542796266047 |
| 20 | 429563383515510620615310131 |
| 21 | 218332153959703843484481031721 |
[1,-1,1,53,-215,3341,199159,391337,-4128623, 710371933,257347648013,6178130243,-111384981593, 225570264096917,1407269115959761,1546226961439379, 69849267671401979,5665951032145572087083, 467410556088873329284747,-1602619428542796266047, 429563383515510620615310131, 218332153959703843484481031721] |