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A064430 as a simple table

n a(n)
1 1
2 1
3 6
4 864
5 43200000
6 272097792000000000
7 3416681839784939886182400000000000
8 1847600699255039694224318542233446367734016245760000000000000000 

[1,1,6,864,43200000,272097792000000000,
 3416681839784939886182400000000000,
 18476006992550396942243185422334463677340162457600\
 00000000000000]

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Last modified April 25 07:41 EDT 2024. Contains 371964 sequences. (Running on oeis4.)