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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 552 |
| 2 | 182822400 |
| 3 | 34935377382604800 |
| 4 | 3845511050527581426155520000 |
| 5 | 243818371522804938361462294653739991040000 |
| 6 | 8904331592711942612922766177589119660252055149215744000000 |
[1,552,182822400,34935377382604800, 3845511050527581426155520000, 243818371522804938361462294653739991040000, 89043315927119426129227661775891196602520551492157\ 44000000] |