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A309972 as a simple table

n a(n)
0 1
1 1
2 2
3 18
4 6912
5 216000000
6 1632586752000000000
7 498266101635303733401600000000000
8 1140494258799407218656986754465090350453096448000000000000000

[1,1,2,18,6912,216000000,1632586752000000000,
 498266101635303733401600000000000,
 11404942587994072186569867544650903504530964480000\
 00000000000]

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Last modified June 14 12:26 EDT 2021. Contains 345025 sequences. (Running on oeis4.)