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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -4 |
| 2 | 84 |
| 3 | -4320 |
| 4 | 410640 |
| 5 | -62424000 |
| 6 | 13882209600 |
| 7 | -4250758886400 |
| 8 | 1715097849504000 |
| 9 | -881945575315584000 |
| 10 | 563062441711086720000 |
| 11 | -436991853893041873920000 |
| 12 | 405186856780938968885760000 |
[1,-4,84,-4320,410640,-62424000,13882209600, -4250758886400,1715097849504000, -881945575315584000,563062441711086720000, -436991853893041873920000, 405186856780938968885760000] |