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A172857 as a simple table

n a(n)
1 0
2 0
3 120
4 838792
5 39205553940
6 8867410986416760
7 8131811998479859238220
8 26150377893243567040474379136
9 261894259231474231217142097747097616
10 7402668628365416446775191706258616053932800 

[0,0,120,838792,39205553940,8867410986416760,
 8131811998479859238220,
 26150377893243567040474379136,
 261894259231474231217142097747097616,
 7402668628365416446775191706258616053932800]

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Last modified August 9 09:06 EDT 2022. Contains 356021 sequences. (Running on oeis4.)