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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 42 |
| 2 | 14617044842400 |
| 3 | 5458228515594914179387748450655273588000 |
| 4 | 864891828322912925373153355728411014930091519471102108791040960580578545212124160000 |
[1,42,14617044842400, 5458228515594914179387748450655273588000, 86489182832291292537315335572841101493009151947110\ 2108791040960580578545212124160000] |