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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | -1 |
| 4 | 3920 |
| 5 | 588 |
| 6 | 1 |
| 7 | -8100814848000 |
| 8 | -39479417600 |
| 9 | -2979480 |
| 10 | -1 |
| 11 | 1611539173017517109941370880000 |
| 12 | 61936836322916982325248000 |
| 13 | 39909735720699801600 |
| 14 | 163294580720 |
| 15 | 1 |
| 16 | -6618882426924155530592746398747608414335176303936798720000 |
[1,-1,-1,3920,588,1,-8100814848000,-39479417600, -2979480,-1,1611539173017517109941370880000, 61936836322916982325248000,39909735720699801600, 163294580720,1, -6618882426924155530592746398747608414335176303936\ 798720000] |