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A079566
as a simple table
n
a(n)
1
1
2
1
3
2
4
5
5
16
6
63
7
313
8
2014
9
16724
10
178608
11
2422046
12
41049952
13
855470220
[1,1,2,5,16,63,313,2014,16724,178608,2422046, 41049952,855470220]