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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 240 |
| 4 | 13872 |
| 5 | 1924416 |
| 6 | 641053824 |
| 7 | 512493408768 |
| 8 | 983311673066496 |
| 9 | 4527565995515535360 |
| 10 | 50027087182874567811072 |
| 11 | 1326495212666507820379570176 |
[1,10,240,13872,1924416,641053824,512493408768, 983311673066496,4527565995515535360, 50027087182874567811072, 1326495212666507820379570176] |