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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | -1 |
| 5 | 4 |
| 6 | -12 |
| 7 | -3 |
| 8 | 640 |
| 9 | -9721 |
| 10 | 107849 |
| 11 | -766116 |
| 12 | -5716810 |
| 13 | 438016259 |
| 14 | -13557651987 |
| 15 | 318299775147 |
| 16 | -5284369281919 |
| 17 | -5483686862123 |
| 18 | 6119663470743306 |
| 19 | -388801742002632589 |
| 20 | 17841761552418336070 |
| 21 | -645131407697518621805 |
| 22 | 14383670984970068901209 |
| 23 | 384858376828629625293001 |
[1,1,0,-1,4,-12,-3,640,-9721,107849,-766116, -5716810,438016259,-13557651987,318299775147, -5284369281919,-5483686862123,6119663470743306, -388801742002632589,17841761552418336070, -645131407697518621805,14383670984970068901209, 384858376828629625293001] |