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| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | -2 |
| 2 | 0 |
| 3 | 118 |
| 4 | 2800 |
| 5 | 61318 |
| 6 | 1417472 |
| 7 | 35570638 |
| 8 | 973741824 |
| 9 | 29023111918 |
| 10 | 938082635776 |
| 11 | 32730551749894 |
| 12 | 1227224552173568 |
| 13 | 49239697945731382 |
| 14 | 2105895743771443200 |
| 15 | 95663702284183543582 |
| 16 | 4600926951773050961920 |
| 17 | 233592048827366522661214 |
[-1,-2,0,118,2800,61318,1417472,35570638, 973741824,29023111918,938082635776,32730551749894, 1227224552173568,49239697945731382, 2105895743771443200,95663702284183543582, 4600926951773050961920,233592048827366522661214] |