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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | -21 |
| 3 | -139 |
| 4 | 531 |
| 5 | 6489 |
| 6 | -9723 |
| 7 | -292293 |
| 8 | -135117 |
| 9 | 12514313 |
| 10 | 29905809 |
| 11 | -501239553 |
| 12 | -2310673379 |
| 13 | 18245192679 |
| 14 | 140574917259 |
| 15 | -562805403867 |
| 16 | -7557237645741 |
| 17 | 11275709877369 |
| 18 | 371974318253601 |
| 19 | 201852054629631 |
| 20 | -16932135947326551 |
| 21 | -42530838930147813 |
| 22 | 709138646702505999 |
[1,3,-21,-139,531,6489,-9723,-292293,-135117, 12514313,29905809,-501239553,-2310673379, 18245192679,140574917259,-562805403867, -7557237645741,11275709877369,371974318253601, 201852054629631,-16932135947326551, -42530838930147813,709138646702505999] |