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A243550
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
15
6
58
7
255
8
1510
9
10766
10
94109
11
945773
12
10577294
[1,1,2,6,15,58,255,1510,10766,94109,945773, 10577294]