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A084560
as a simple table
n
a(n)
1
2
2
139
3
1627
4
18839
5
123229
6
776257
7
3873011
8
23884639
9
36539311
10
196943081
[2,139,1627,18839,123229,776257,3873011,23884639, 36539311,196943081]