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A184712
as a simple table
n
a(n)
1
1
2
1
3
2
4
2
5
6
6
65
7
560
8
6939
9
89952
10
1372469
11
22986721
12
423073642
13
8439627699
[1,1,2,2,6,65,560,6939,89952,1372469,22986721, 423073642,8439627699]