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A174972 as a simple table

n a(n)
0 1
1 3
2 20
3 576
4 278528
5 35433480192
6 299759591197780213760
7 10974106333200265446693831089674524819456
8 7439641733497565555964435786808198079572596514767406239535149772508418579365888

[1,3,20,576,278528,35433480192,
 299759591197780213760,
 10974106333200265446693831089674524819456,
 74396417334975655559644357868081980795725965147674\
 06239535149772508418579365888]

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Last modified January 21 14:37 EST 2022. Contains 350479 sequences. (Running on oeis4.)