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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 56 |
| 3 | 166320 |
| 4 | 4084080 |
| 5 | 1396755360 |
| 6 | 698377680 |
| 7 | 146659312800 |
| 8 | 1075501627200 |
| 9 | 37104806138400 |
| 10 | 3710480613840000 |
| 11 | 296838449107200 |
| 12 | 86825246363856000 |
| 13 | 96472495959840000 |
| 14 | 36466603472819520000 |
| 15 | 35251050023725536000 |
| 16 | 272194921062320256000 |
| 17 | 408292381593480384000 |
[1,56,166320,4084080,1396755360,698377680, 146659312800,1075501627200,37104806138400, 3710480613840000,296838449107200, 86825246363856000,96472495959840000, 36466603472819520000,35251050023725536000, 272194921062320256000,408292381593480384000] |