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A103595
as a simple table
n
a(n)
1
1
2
1
3
2
4
3
5
5
6
10
7
21
8
59
9
231
10
1413
11
15474
12
361139
13
22347214
14
4833601540
[1,1,2,3,5,10,21,59,231,1413,15474,361139, 22347214,4833601540]