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A172647 as a simple table

n a(n)
1 0
2 0
3 1
4 1093050
5 31237467004800
6 5520471267708881730181
7 5001985846592510105642103476685
8 19578536057961112914067888563728861113920

[0,0,1,1093050,31237467004800,
 5520471267708881730181,
 5001985846592510105642103476685,
 19578536057961112914067888563728861113920]

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Last modified June 17 22:17 EDT 2019. Contains 324200 sequences. (Running on oeis4.)