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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 288 |
| 4 | 10368 |
| 5 | 1036800 |
| 6 | 103680000 |
| 7 | 20321280000 |
| 8 | 3982970880000 |
| 9 | 1290482565120000 |
| 10 | 418116351098880000 |
| 11 | 202368313931857920000 |
| 12 | 97946263943019233280000 |
| 13 | 66211674425481001697280000 |
| 14 | 44759091911625157147361280000 |
| 15 | 40283182720462641432625152000000 |
[1,2,8,288,10368,1036800,103680000,20321280000, 3982970880000,1290482565120000,418116351098880000, 202368313931857920000,97946263943019233280000, 66211674425481001697280000, 44759091911625157147361280000, 40283182720462641432625152000000] |