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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | -1666 |
| 3 | -20120 |
| 4 | 8326156 |
| 5 | 168671984 |
| 6 | -69348284024 |
| 7 | -1979630798624 |
| 8 | 808588172904080 |
| 9 | 29872264717900864 |
| 10 | -12120918702550359584 |
| 11 | -550935167365293970816 |
| 12 | 222057497165125577139904 |
| 13 | 12008305406761595815509760 |
| 14 | -4807476011385589486479101824 |
[1,4,-1666,-20120,8326156,168671984,-69348284024, -1979630798624,808588172904080,29872264717900864, -12120918702550359584,-550935167365293970816, 222057497165125577139904, 12008305406761595815509760, -4807476011385589486479101824] |