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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | -3 |
| 4 | 11 |
| 5 | 38 |
| 6 | 249 |
| 7 | -2357 |
| 8 | 8767 |
| 9 | 496035 |
| 10 | -3769372 |
| 11 | -299154043 |
| 12 | -12064147359 |
| 13 | 632926474117 |
| 14 | -65604679199921 |
| 15 | -6662962874355342 |
| 16 | -720710377683595651 |
| 17 | 285131375126739646739 |
| 18 | 5206174703484724719135 |
[1,1,-3,11,38,249,-2357,8767,496035,-3769372, -299154043,-12064147359,632926474117, -65604679199921,-6662962874355342, -720710377683595651,285131375126739646739, 5206174703484724719135] |