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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 84480 |
| 4 | 20314800 |
| 5 | 1406896128 |
| 6 | 45028515840 |
| 7 | 840702551040 |
| 8 | 10649688548400 |
| 9 | 99629039431680 |
| 10 | 738969815384064 |
| 11 | 4510653911723520 |
| 12 | 23608607396953920 |
| 13 | 107820702921000960 |
| 14 | 441630820763320320 |
[1,0,0,84480,20314800,1406896128,45028515840, 840702551040,10649688548400,99629039431680, 738969815384064,4510653911723520, 23608607396953920,107820702921000960, 441630820763320320] |