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A110888
as a simple table
n
a(n)
1
1
2
1
3
2
4
3
5
7
6
15
7
48
8
180
9
985
10
6867
11
60108
12
609112
13
6909017
[1,1,2,3,7,15,48,180,985,6867,60108,609112, 6909017]