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A197720
as a simple table
n
a(n)
1
1
2
1
3
22
4
87
5
1726
6
68819
7
4003781
8
565032173
9
152764693020
10
80175405643606
[1,1,22,87,1726,68819,4003781,565032173, 152764693020,80175405643606]