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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | -8 |
| 4 | 129 |
| 5 | -2424 |
| 6 | 87040 |
| 7 | -3354000 |
| 8 | 234927105 |
| 9 | -13619579120 |
| 10 | 1467819193176 |
| 11 | -142339701178080 |
| 12 | 21415200007555200 |
| 13 | -2958022926285910560 |
| 14 | 605932431017659471440 |
| 15 | -110644439905256239190208 |
| 16 | 32132110188849291391675905 |
| 17 | -7427852296898683736690604000 |
[1,1,-8,129,-2424,87040,-3354000,234927105, -13619579120,1467819193176,-142339701178080, 21415200007555200,-2958022926285910560, 605932431017659471440,-110644439905256239190208, 32132110188849291391675905, -7427852296898683736690604000] |