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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -8191 |
| 3 | -690690 |
| 4 | 822573570 |
| 5 | 142081621501 |
| 6 | -102803639194620 |
| 7 | -28281091311058949 |
| 8 | 13668272700177314310 |
| 9 | 5514776417237892113400 |
| 10 | -1808663163639294990384630 |
| 11 | -1056880191873167904305607180 |
| 12 | 224746784451252089897697350159 |
[1,-1,-8191,-690690,822573570,142081621501, -102803639194620,-28281091311058949, 13668272700177314310,5514776417237892113400, -1808663163639294990384630, -1056880191873167904305607180, 224746784451252089897697350159] |