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| n | a(n) |
|---|---|
| 7 | 0 |
| 8 | 210 |
| 9 | 7616 |
| 10 | 185460 |
| 11 | 4200960 |
| 12 | 77887920 |
| 13 | 1310267904 |
| 14 | 21025461600 |
| 15 | 314958758400 |
| 16 | 4765553385120 |
| 17 | 69086614338560 |
| 18 | 1013373907056960 |
| 19 | 14714554645140480 |
| 20 | 212868974122848000 |
| 21 | 3168605413206097920 |
| 22 | 45787509175434048000 |
| 23 | 705241846739554713600 |
| 24 | 10297540417675899801600 |
[0,210,7616,185460,4200960,77887920,1310267904, 21025461600,314958758400,4765553385120, 69086614338560,1013373907056960,14714554645140480, 212868974122848000,3168605413206097920, 45787509175434048000,705241846739554713600, 10297540417675899801600] |