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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 120 |
| 2 | 43545600 |
| 3 | 271159356948480000 |
| 4 | 96447974277170077976494080000000 |
| 5 | 4927617876373416030299815278723491640115200000000000 |
| 6 | 76433315893700635598991132508610825923227961061372903345356800000000000000000 |
[1,120,43545600,271159356948480000, 96447974277170077976494080000000, 49276178763734160302998152787234916401152000000000\ 00, 76433315893700635598991132508610825923227961061372\ 903345356800000000000000000] |