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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -4 |
| 2 | 40 |
| 3 | -934 |
| 4 | 42648 |
| 5 | -3295194 |
| 6 | 387494364 |
| 7 | -64310993478 |
| 8 | 14291172086544 |
| 9 | -4092687247885554 |
| 10 | 1467156197049970084 |
| 11 | -643428519154728257086 |
| 12 | 338835140564954843727832 |
| 13 | -210975968109576390124392746 |
[1,-4,40,-934,42648,-3295194,387494364, -64310993478,14291172086544,-4092687247885554, 1467156197049970084,-643428519154728257086, 338835140564954843727832, -210975968109576390124392746] |