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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5040 |
| 2 | 87178291200 |
| 3 | 51090942171709440000 |
| 4 | 304888344611713860501504000000 |
| 5 | 10333147966386144929666651337523200000000 |
| 6 | 1405006117752879898543142606244511569936384000000000 |
[1,5040,87178291200,51090942171709440000, 304888344611713860501504000000, 10333147966386144929666651337523200000000, 14050061177528798985431426062445115699363840000000\ 00] |