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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 8 |
| 4 | 216 |
| 5 | 6048 |
| 6 | 203256 |
| 7 | 8627472 |
| 8 | 475098048 |
| 9 | 34505348760 |
| 10 | 3341298530016 |
| 11 | 434656549010376 |
| 12 | 76372500634028280 |
| 13 | 18198479103071529600 |
| 14 | 5898858710813046614376 |
| 15 | 2607147775322232410982384 |
[0,0,8,216,6048,203256,8627472,475098048, 34505348760,3341298530016,434656549010376, 76372500634028280,18198479103071529600, 5898858710813046614376,2607147775322232410982384] |