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A000848
as a simple table
n
a(n)
1
8
2
120
3
16880
4
1791651440
5
990442962518469863888
6
38923012745870263852909632697729215009690731472
[8,120,16880,1791651440,990442962518469863888, 38923012745870263852909632697729215009690731472]