The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | -3456 |
| 7 | -1680700 |
| 8 | -656015360 |
| 9 | -257682513924 |
| 10 | -109238438400000 |
| 11 | -51314410315015848 |
| 12 | -26971484454564249600 |
| 13 | -15900584540593785814600 |
| 14 | -10502594915812780982104064 |
| 15 | -7751030669527270764328312500 |
| 16 | -6368927485184314316526213660672 |
| 17 | -5804243263631170614915627777847500 |
[0,0,0,0,0,0,-3456,-1680700,-656015360, -257682513924,-109238438400000,-51314410315015848, -26971484454564249600,-15900584540593785814600, -10502594915812780982104064, -7751030669527270764328312500, -6368927485184314316526213660672, -5804243263631170614915627777847500] |