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A209072
as a simple table
n
a(n)
1
1
2
8
3
56
4
563
5
6006
6
68723
7
817594
8
10030238
9
125899533
10
1609360719
11
20877938573
12
274173012896
[1,8,56,563,6006,68723,817594,10030238,125899533, 1609360719,20877938573,274173012896]