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A006558
as a simple table
n
a(n)
1
1
2
2
3
33
4
242
5
11605
6
28374
7
171893
8
1043710445721
9
2197379769820
10
2642166652554075
[1,2,33,242,11605,28374,171893,1043710445721, 2197379769820,2642166652554075]