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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 10 |
| 6 | 105 |
| 7 | 1015 |
| 8 | 9625 |
| 9 | 90972 |
| 10 | 861420 |
| 11 | 8191920 |
| 12 | 78309000 |
| 13 | 752317280 |
| 14 | 7257522272 |
| 15 | 70223986560 |
| 16 | 680703296000 |
| 17 | 6601793730560 |
| 18 | 63984047339520 |
| 19 | 619018056228864 |
| 20 | 5972223901440000 |
| 21 | 57415027394027520 |
| 22 | 549677356175073280 |
| 23 | 5238367168966328320 |
| 24 | 49678823782558924800 |
| 25 | 468783944069762252800 |
[0,0,10,105,1015,9625,90972,861420,8191920, 78309000,752317280,7257522272,70223986560, 680703296000,6601793730560,63984047339520, 619018056228864,5972223901440000, 57415027394027520,549677356175073280, 5238367168966328320,49678823782558924800, 468783944069762252800] |