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A280020
as a simple table
n
a(n)
1
1
2
1
3
3
4
7
5
27
6
211
7
1743
8
15247
9
219747
10
5379451
11
154297863
12
5085738967
13
225515577147
14
14272681411171
[1,1,3,7,27,211,1743,15247,219747,5379451, 154297863,5085738967,225515577147,14272681411171]